BAOSTEEL METAL / LINE PIPE MATERIAL

API 5L X70
Line Pipe

X70 / L485 | PSL1 & PSL2 | API SPEC 5L, 47TH EDITION (2026)

485 MPa MIN. YIELD REFERENCESMLS / HFW / SAW BY APPROVED ROUTEX70Q / X70M · CVN / DWTT · NDE

HIGH-STRENGTH TRANSMISSION PIPE / X70 - L485

Specify X70 yield strength with verified toughness, weldability and the approved pipe manufacturing route.

Source API 5L X70 / L485 line pipe for engineered oil and gas transmission projects. Confirm PSL1 or PSL2, X70Q/X70M where applicable, actual OD × wall thickness, permitted mill process, toughness test plan and coating scope. Submit your material requisition for a project-specific quotation.

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Review X70 technical requirements ↓

API 5L X70 high strength line pipe bundles prepared for project shipment

8 Million MTCompany-wide annual steel production

1 Million MTCompany-wide regular inventory

500,000 m²Reported overall factory area

1,000+Employees across the business

01 / PIPE SPECIFICATION

API 5L X70 Line Pipe Specifications

For X70 pipeline projects, align the API edition, PSL, permissible Q/M grade suffix, pipe manufacturing route and fracture-control requirements before confirming dimensions and cost.

Parameter	Purchase requirement
Grade	API 5L X70 / L485; state an approved Q / M suffix when the contracted PSL2 grade requires it
Product standard	API Specification 5L, 47th edition published June 2026; enter the contractual edition and applicable amendments
Product specification level	PSL1 or PSL2; include permissible delivery-condition suffix for PSL2 where required
Manufacturing method	Seamless (SMLS), HFW/ERW, or SAW subject to edition-specific process permission, diameter, wall thickness and mill qualification
Pipe dimension	Actual outside diameter (OD) × specified wall thickness (WT); NPS / Schedule only when requested as a reference
Length	Random or fixed length as agreed, with length tolerance and handling requirements
Pipe ends	Plain, beveled or project-specified weld preparation; protect during transport
Surface protection	Black / mill finish, temporary rust protection or contracted external coating
Inspection package	Chemistry, pipe-body and weld tensile, hydrostatic, NDE, notch toughness, Y/T ratio and project-specific tests as applicable
Documents	Heat-traceable MTC, pipe markings, NDE and hydro reports, impact records if required, and project ITP / third-party release
Supply	Individual line items by OD × WT, PSL, length and tonnage; production and stock to be confirmed

Edition control: API published Spec 5L, 47th edition on June 2, 2026. The numerical strength ranges commonly available online originate from prior editions. Verify every contractual acceptance limit in the agreed edition, its amendments and the mill inspection plan.

02 / PSL1 AND PSL2

Select the Right Product Specification Level

For X70 / L485, the selected PSL and delivery suffix govern available production routes and testing. Historical PSL2 X70Q and X70M describe different manufacturing conditions and require confirmation under the specified API edition.

PSL1 / GRADE X70

PSL1 X70 / L485

Order Grade X70 / L485 with a specified API edition, grade, manufacturing route and pipe dimensions. Published earlier-edition strength references are 485 MPa minimum yield and 570 MPa minimum tensile; contractual acceptance is governed by the ordered edition.

Common strength reference: 485 MPa minimum yield, 570 MPa minimum tensile
Confirm chemistry and test conditions by edition and manufacturing route
Agree pipe length, dimensional tolerance and marking
Specify hydrotest, NDE and documents as required

PSL2 / CONTROLLED DELIVERY

PSL2 X70Q / X70M

Earlier PSL2 X70Q / L485Q and X70M / L485M relate to quenched-and-tempered and thermomechanically controlled delivery conditions. Confirm grade suffix, welding and mill qualifications, fracture-control test requirements and the approved diameter / wall range for your order.

Confirm X70Q or X70M applicability, processing and pipe route against the contracted API edition.
Historical 46th-edition X70Q/M pipe-body references: 485–635 MPa yield and 570–760 MPa tensile.
Earlier Y/T ratio limit 0.93 applies at OD greater than 323.9 mm; verify the current edition and actual pipe size.
Specify Charpy, DWTT, NDE, weld testing and service-specific annexes as required by your project.

Reference versus guarantee: X70Q / X70M and the PSL2 numerical ranges above refer to earlier published API 5L tables. The agreed edition, mill route, pipe dimensions and MTC determine the final acceptance limits. Sour service, offshore and CO₂ transmission may require further qualification.

03 / X70 / L485 MATERIAL PROPERTIES

Mechanical Strength and Chemical Composition

X70 offers a 485 MPa nominal minimum yield class. Use the historic X70Q/M figures below for initial technical screening; actual mechanical, chemical, welding and toughness acceptance follows the contractually specified API edition.

Mechanical Property Overview

Property	X70 purchasing reference
Minimum yield strength, common X70 reference	485 MPa / 70,300 psi
Minimum tensile strength, common X70 reference	570 MPa / 82,700 psi
PSL1 common strength reference	485 MPa minimum yield; 570 MPa minimum tensile; verify contracted edition
PSL2 X70Q / X70M historical yield range	485–635 MPa; prior-edition PSL2 table
PSL2 X70Q / X70M historical tensile range	570–760 MPa; prior-edition PSL2 table
PSL2 historical maximum yield-to-tensile ratio	0.93 where applicable; diameter and edition requirements must be checked
Elongation	Determine minimum from the contractual API formula and test specimen conditions
Weld-seam properties	Applicable weld-seam tensile strength and NDE acceptance depend on the approved HFW / SAW route

The 485 / 570 MPa minima and the 485–635 / 570–760 MPa PSL2 ranges are published earlier-edition values. The 0.93 Y/T ceiling in the earlier PSL2 table applied only to OD above 323.9 mm. Confirm the 47th-edition limits before specifying them as guaranteed values.

Chemistry, Carbon Equivalent & Weldability

Material control	X70 order requirement
X70 / L485 PSL1	Confirm heat and product chemistry to the contracted API edition and chosen seamless or welded route.
X70Q / L485Q	Confirm the allowed quenched-and-tempered delivery state, qualified heat treatment, wall thickness and mechanical / impact criteria.
X70M / L485M	Confirm thermomechanical rolling / forming route, mill qualification, chemical limits, weldability and required pipe-body / weld toughness.
C, Mn, Si, P and S	Request applicable individual limits, footnotes and actual heat/product analyses; universal limits are not quoted here.
Nb, V, Ti and other additions	Verify permitted individual / combined microalloy additions under the ordered grade, route and edition.
CE IIW / CE Pcm	Specify the applicable carbon-equivalent formula, thickness rule and weldability acceptance criteria.
Heat traceability	Request MTC, heat numbers, pipe markings and test reports matched to every supply lot.

For X70Q / X70M, chemistry and microalloying depend on PSL, seamless or welded manufacture, wall thickness and approved heat-treatment route. Use the X70-specific limits verified in the contracted edition and MTC, with separate validation of any X60/X65 comparisons.

Weldability and fracture control: Review carbon equivalent (CE IIW / Pcm), weld procedure qualification (WPS / PQR), heat-affected-zone toughness, Y/T ratio where applicable and pipe-body / weld acceptance. Strength alone does not determine pressure rating or suitability for a pipeline route.

04 / AVAILABLE PIPE MANUFACTURING ROUTES

Seamless, HFW/ERW and SAW X70 Line Pipe

At the X70/L485 strength level, verify thermomechanical or quenched-and-tempered processing, HFW/SAW seam controls and pipeline fracture-performance requirements with the qualified mill. Permitted routes vary by the ordered grade suffix, wall and OD.

01 / SMLS

Seamless X70 Line Pipe

Consider seamless X70 only for the approved grade, size and delivery condition. Confirm mill capability, heat treatment, pipe-body microstructure, tensile and impact properties, and the documented manufacturing route.

NO LONGITUDINAL WELDOD × WT

02 / HFW / ERW

High-Frequency Welded X70

For HFW X70, request mill qualification and details of seam heat treatment, bond-line NDE, weld mechanical testing and HAZ toughness. Align the testing procedure with API Spec 5L 47th-edition changes and the project ITP.

High frequency welded line pipe production and seam inspection equipment

03 / SAW

SAW X70 Transmission Pipe

For large-diameter SAWL / SAWH X70, verify plate or strip feedstock, forming, weld procedure qualifications, weld consumables, full seam inspection, impact / fracture testing and agreed dimensional controls.

Large diameter submerged arc welded transmission line pipe in production

Quote routes only after the requested X70 grade, PSL, suffix, OD × WT and required toughness tests are reviewed. No single manufacturing route is presumed suitable for every X70 design condition.

05 / LINE PIPE DIMENSIONS

Order X70 by Actual Outside Diameter and Wall Thickness

Specify X70 by actual outside diameter and specified wall thickness. NPS / Schedule examples support quick estimates, while line-pipe manufacture and pipeline design require the project OD × WT, tolerances and approved length.

Nominal size	OD (mm)	SCH 40 WT (mm)	SCH 80 WT (mm)
NPS 1/2	21.3	2.77	3.73
NPS 1	33.4	3.38	4.55
NPS 2	60.3	3.91	5.54
NPS 4	114.3	6.02	8.56
NPS 6	168.3	7.11	10.97
NPS 8	219.1	8.18	12.70

Confirm every line item

Actual outside diameter and specified wall thickness
Length and end preparation / bevel angle
PSL1/PSL2, required delivery condition and mill route
Pipe straightness, ovality and dimensional tolerances
External coating or mill-finish condition
Pipe weight basis, handling and bundle configuration

The schedule table is a dimensional aid and does not establish availability, allowable pressure, or project suitability.

Wall thickness for pressure containment, fracture control and route loads is selected by the pipeline design authority. Nominal Schedule values and the calculator are for estimating and do not establish a pressure rating or material suitability.

06 / PIPELINE TESTING AND ACCEPTANCE

Specify the Inspection and Testing Package

For X70, your ITP should identify body and weld tensile tests, carbon equivalent, seam NDE, hydrotest, CVN toughness and any DWTT or fracture-propagation assessment required by the project specification. The 47th edition also includes updated CO₂ transport and NDE provisions.

01 / TESTING

Chemical & Mechanical

Verify heat / product chemistry, pipe-body tensile properties, weld-seam tests, carbon equivalent and applicable Y/T ratio by edition.

02 / TESTING

Hydrostatic Test

Specify the required hydrostatic pressure, hold time, gauge calibration and test records against the agreed API edition.

03 / TESTING

Nondestructive Testing

Identify inspection coverage for pipe body and HFW / SAW weld seams, personnel qualification and acceptance levels.

04 / TESTING

Toughness & Special Service

Specify CVN, DWTT and fracture-propagation assessment where applicable; define supplementary HIC / SSC or CO₂ tests by service.

Send your project ITP with the material requisition.

Our quotation review can address testing, documentation and third-party witnessing before ordering.

07 / PIPELINE APPLICATIONS

Where X70 / L485 Line Pipe Is Specified

X70 is chosen for high-strength transmission line designs when engineering has confirmed pressure, steel wall requirements, qualified welding, fracture control, coating protection and regional pipeline construction codes. Final wall design requires separate verification.

01 / TRANSMISSION

Oil & Gas Transmission

Long-distance oil and gas transmission where the project design accepts X70 pipe and the required fracture-control measures.

02 / COLLECTION

Field Gathering Networks

High-capacity gathering and transfer networks with verified pressure, welding and location class requirements.

03 / PROJECT PIPING

Industrial Energy Pipelines

Engineered energy pipeline sections that require a defined X70 welding and inspection package.

04 / CONSTRUCTION

Pipeline Spools & Tie-Ins

Tie-in sections and fabricated line-pipe spools with controlled end geometry, dimensions and traceable materials.

05 / INFRASTRUCTURE

Cross-Country Lines

Large-volume line-pipe supply packages with mill-lot scheduling, coating and transportation plans.

06 / SPECIAL SERVICE

Engineered CO₂ / Sour Systems

Special-service X70 pipe considered with defined sour / CO₂ engineering assessments, supplementary tests and corrosion protection.

For engineers and project buyers

Provide the pipeline material specification, service description, route, diameter, wall design and required inspections. X70 can be assessed against those defined requirements; its grade name alone is not a service-life or corrosion guarantee.

Long distance oil and gas transmission line pipe installation works

08 / PIPE WEIGHT CALCULATOR

Calculate X70 Line Pipe Weight and Tonnage

Enter actual OD, wall thickness, length and piece count for a nominal bare-steel mass estimate. NPS and Schedule choices are reference presets; coating, lining, end caps and bundles are excluded.

Pipe Size and Quantity

Reference NPS sizeWall schedule reference

Outside diameter (mm)Wall thickness (mm)Individual pipe length (m)Number of pipes (pcs)

Calculation uses a nominal steel density of 7,850 kg/m³ and the annular pipe cross-section. The result excludes coatings, couplings, end caps, seawater contents and shipping materials.

Estimated Pipe Weight

Total net pipe weight9.645 MTFor the entered dimensions and number of pipes

16.075 kg/m — theoretical mass per metre

96.45 kg — one pipe

102.26 mm — calculated inside diameter

600.0 m — total pipe length

Nominal bare-steel estimate; confirm actual net weight and mill tolerances.

Weight formula: kg/m = π × (OD − WT) × WT × 0.00785, with OD and WT in mm. Final supply mass depends on measured dimensions and agreed weighing method.

09 / X70 MANUFACTURING PROCESS

Mill Production, Pipe Identification and Traceability

X70 mill production requires documented control of steel chemistry, rolling or heat treatment, weld processing and pipe-body / seam properties. Mill approvals and testing evidence determine the permitted route for each tender.

Review the X70 steel chemistry and selected mill production route
Control forming, weld-seam processing or seamless rolling as appropriate
Apply the contracted delivery condition and heat-treatment rules
Measure OD, wall, ovality, straightness and pipe length
Complete line-pipe mechanical, hydrostatic and nondestructive testing
Mark pipe and retain heat / lot certificate traceability

For X70, ask for mill-process qualification, applicable TMCP/Q delivery records, heat traceability and pipe-body / HAZ toughness. Production routes differ between seamless, HFW and SAW and must match the approved specification.

Explore Manufacturing →

Pipeline steel pipe forming and dimensional inspection at production facility

10 / B2B LINE PIPE PROCUREMENT

Why Source API 5L X70 Through BAOSTEEL METAL?

Coordinate X70 / L485 enquiries with defined grade suffixes, sizes, inspected manufacturing routes and transparent quotation conditions.

01 / BUSINESS SCALE

Steel Supply Platform

Company-wide annual steel production of 8 million MT and reported regular stock of 1 million MT across all steel categories; X70 availability is checked per order.

02 / TECHNICAL ALIGNMENT

PSL and Mill Route Review

Review the product level, X70 delivery condition, pipe dimensions, manufacturing route and inspection plan together.

03 / DOCUMENTATION

Inspection & MTC Coordination

Include testing, traceability, third-party witnessing and documentation requirements in your purchase specification.

04 / EXPORT PLANNING

Project Delivery Coordination

Coordinate batch schedules, packing, markings, pipe-end protection and shipment documents for the destination.

11 / QUALITY CONTROL / CERTIFICATES

Verify X70 Pipe Material and Test Records

Check every X70 heat and pipe lot against the ordered API edition and project ITP. Match chemistry, tensile and seam tests, toughness results, hydrotest and NDE documents to the required grade suffix and mill route.

Heat and product chemistry under the contracted edition
Pipe body tensile testing and applicable weld tests
Mill test certificate linked to heat and pipe marks
Hydrostatic test reports and calibrated test records
NDE reports for permitted pipe body and weld routes
Charpy / DWTT and supplementary tests if specified
Dimensional verification and coating inspection, if ordered
Third-party inspection and ITP witnessing as agreed

Quality Control →

Line pipe inspector measuring wall thickness and recording nondestructive testing

Special-service qualification: PSL2/X70 markings alone do not establish sour-gas, offshore or CO₂ service approval. Specify environmental conditions, supplementary annexes, fracture assessment and corrosion-control criteria with the pipeline engineering team.

12 / OPTIONAL PIPE SERVICES

Specify Cuts, Bevels and Surface Protection

For X70 field weld preparation, provide the bevel design, required end squareness and tolerances, protection system and pipe-marking instructions. These conditions help align factory preparation with the qualified construction WPS.

Cut-to-Length PipeConfirm cut length and finished length tolerance per isometric or fabrication list.
End BevelingState bevel geometry, land, dimensional tolerance and weld preparation standard.
Surface PreparationSpecify blast-cleaning, temporary rust prevention or external coating subject to process availability.
Pipe MarkingIdentify API grade, PSL, dimensions, heat, order item and any additional traceability marks.
Protective End CapsArrange end protection and coated-surface handling instructions suited to the shipment.

High strength line pipe with beveled ends ready for field welding

13 / BULK PIPE PROCUREMENT

Confirm X70 Availability, Lot Plan and Lead Time

X70 supply planning depends on the chosen mill, X70Q/M condition, OD × WT, PSL, weld inspections, toughness test plan, optional coating and destination. Availability and lead time are established per material requisition.

From project MR to supply plan

Submit your X70 pipeline material schedule with requested pipe lengths, quantity by diameter and wall, mill route, PSL2 suffix and the required ITP. Quotations can then identify relevant stock or production conditions.

List each OD × WT and total metres / tonnes
Identify the exact X70 PSL / delivery condition
Specify permitted seamless or welded manufacturing process
Attach approval lists, coating and welding requirements
Confirm third-party inspection and MTC requirements
State destination, Incoterms and target delivery date

Steel Inventory →

Bulk pipeline steel pipe stacked with traceable heat and lot markings

The stated 1 million MT regular inventory applies to the company’s wider steel business, not a reserved X70 lot. Confirm the source mill, grade, process, wall, test results and delivery schedule for each line item.

14 / EXPORT PREPARATION

Protect X70 Line Pipe During Loading and Shipment

For X70 pipeline projects, agree batch handling, bevel and coating protection, traceability markings, safe lift points and transport restraints before dispatch.

Bundle and Lift PlanSet safe bundle size, sling locations, blocking and loading method.
Pipe End ProtectionProtect bevels, threaded ends (if ordered), coating edges and pipe openings.
Handling of Coated PipeUse agreed separators, dunnage and loading instructions to reduce coating damage.
Lot Marking and IdentificationMaintain size, PSL, grade, heat identification and shipping mark traceability.
Inspection and Shipping DocumentsReconcile packing list, MTC, inspection release and commercial paperwork with the order.

Contact Export Team →

Export shipment of protected steel line pipe bundles in transport arrangement

15 / GRADE SELECTION

Compare X70 With Other Pipeline Steel Grades

Compare the common minimum yield strength classes for preliminary ordering. Grade substitution still requires independent pressure design, welding, fracture-control, dimensional and material qualification.

Pipe grade	Common minimum yield reference	Material selection note
API 5L Grade B / L245	245 MPa	Lower minimum yield class for separately engineered line pipe
API 5L X52 / L360	360 MPa	Lower minimum yield reference; approval depends on service specification
API 5L X60 / L415	415 MPa	Lower strength grade; welding and toughness acceptance differ
API 5L X65 / L450	450 MPa	Next lower line-pipe strength class with distinct qualification
API 5L X70 / L485	485 MPa	CURRENT GRADE · PSL1 or PSL2; check X70Q / X70M, fracture tests and mill route
ASTM A106 Grade B	240 MPa	Seamless high-temperature process pipe under another standard
ASTM A333 Grade 6	240 MPa	Low-temperature seamless pipe with separate impact acceptance

X70 is a higher yield class than X65, but strength is not a stand-in for allowable pressure, verified weldability or fracture arrest performance. Confirm design-wall calculations, seam qualification and line-pipe documentation before changing grade.

17 / BUYER FAQ

API 5L X70 Line Pipe FAQ

Answers to frequent technical and sourcing questions about X70/L485, PSL2, pipe dimensions, test records and quotations.

What does API 5L X70 / L485 mean?

X70 / L485 designates a high-strength line-pipe grade with a commonly published minimum yield reference of 485 MPa. State the API edition, PSL, applicable Q/M suffix and inspection program in the purchase requisition.

Which edition of API 5L is currently published?

API announced the 47th edition of API Specification 5L on June 2, 2026. Your contract and any cited amendments determine the specification used for acceptance.

What strength is specified for X70 line pipe?

Earlier API 5L tables list 485 MPa minimum yield and 570 MPa minimum tensile. Earlier PSL2 X70Q/M tables give 485–635 MPa yield and 570–760 MPa tensile. Confirm all limits against the applicable contract edition.

What is the difference between X70 PSL1 and PSL2?

PSL2 has additional controls over chemistry, delivery state, material properties, toughness, tests and traceability. Your X70 order should identify its PSL plus any applicable special-service annexes and inspection documents.

How are X70Q and X70M different?

In earlier PSL2 designations, Q denotes quenched-and-tempered delivery and M denotes thermomechanically controlled delivery. The actual allowed route, wall thickness, chemical limits and toughness requirements depend on the ordered API edition.

Can X70 be supplied as seamless, HFW or SAW pipe?

The permitted manufacturing route depends on pipe dimensions, grade suffix, PSL and the approved mill. Check process qualification and available diameter / wall range before selecting a route.

Should I give NPS / Schedule or actual OD × WT?

Provide actual outside diameter, specified wall thickness, lengths and quantities. NPS and Schedule are useful reference dimensions; the project pipe schedule and drawings govern production.

Why do X70 projects specify Charpy and DWTT testing?

Charpy assesses notch toughness and DWTT supports fracture-behaviour evaluation under applicable rules. Required test method, temperature, specimen, diameter applicability and acceptance must be specified for your route and edition.

Is X70 suitable for CO₂ or sour-gas transmission?

Suitability needs a documented project assessment for water, impurities, phase conditions, corrosion, HIC/SSC where relevant, fracture control and the design code. The grade designation by itself does not qualify the service.

Which certificates and inspection records should I request?

Request the heat-traceable MTC, product chemistry, pipe-body and weld tests, hydrostatic and NDE records, dimensions and specified Charpy / DWTT reports. Add third-party releases where the contract requires them.

How does the X70 pipe weight calculator work?

It calculates a hollow-annulus steel mass from the entered OD, wall thickness, length, quantity and 7,850 kg/m³ density. Coatings, internal lining, end protection and mill tolerances are outside the estimate.

What details are needed for an X70 price quotation?

Send the API edition, PSL, X70Q/M condition where relevant, OD × wall thickness, lengths, quantities, authorized mill processes, coating, required testing, delivery destination and project timetable.

BAOSTEEL METAL / API 5L X70

Request API 5L X70 Line Pipe Pricing

Send your X70 / L485 material requisition with API edition, PSL, Q/M suffix if required, OD × WT, lengths and quantity by item. Include qualified pipe routes, Charpy / DWTT requirements, weld tests, coating and certification package so the quotation matches the project schedule.