Global Steel Supply & Processing
ASTM A312/A312M-25 · TP304L / UNS S30403 · SEAMLESS & WELDED
STAINLESS PIPE / BULK PROCUREMENT
Source ASTM A312 TP304L seamless or welded pipe by NPS, S-series schedule, cut length and end condition. Send your piping BOQ and applicable welding, inspection and material-certificate requirements for a grade-specific quotation.
Explore pipe specifications ↓Define TP304L, the manufacturing route, pipe size, material certification and welding requirements before requesting bulk pricing.
| Specification | What to state in the RFQ |
|---|---|
| Material / designation | TP304L / UNS S30403 / low-carbon austenitic stainless steel |
| Primary piping standard | ASTM A312/A312M-25; confirm the applicable contract edition |
| Nominal pipe dimensions | ASME B36.19-2022; NPS and stainless-steel S-series schedules |
| Manufacturing | Seamless; straight-seam welded; heavily cold-worked welded per applicable product scope |
| Diameter and wall | Specify exact OD × nominal wall, or NPS with Schedule 5S / 10S / 40S / 80S |
| Length and ends | Random length / fixed cut length; plain or prepared ends by agreement |
| Delivery state | Heat-treated in the condition required by the ordered ASTM A312 edition; confirm finish |
| Certificates | MTC / heat or lot traceability; chemistry, tensile and pipe examination as contracted |
| Surface options | Mill, pickled, mechanically polished or specified finish where available |
| Commercial offer | Bulk tonnage or piece quantity, destination, delivery and inspection terms |
For A312 TP304L pipe, verify chromium 18–20%, nickel 8–13% and the lower-carbon limit against the ordered edition.
| Element | TP304L reference composition |
|---|---|
| Chromium (Cr) | 18.00–20.00% |
| Nickel (Ni) | 8.00–13.00% |
| Carbon (C) | 0.035% max. (ASTM A312 pipe reference) |
| Manganese (Mn) | 2.00% max. |
| Silicon (Si) | 1.00% max. |
| Phosphorus (P) | 0.045% max. |
| Sulfur (S) | 0.030% max. |
The 0.035% carbon figure is an ASTM A312 TP304L pipe reference, not a universal limit across every 304L product standard. Verify heat analysis, ordered edition and any tighter project chemistry.
A312 TP304L has distinct reference minima from TP304. Check the actual tensile test orientation, heat-treated condition and MTC.
| Property | TP304L reference | Acceptance note |
|---|---|---|
| Minimum tensile strength, Rm | 485 MPa (70 ksi) | Reference minimum for ASTM A312 TP304L |
| Minimum 0.2% yield strength, Rp0.2 | 170 MPa (25 ksi) | Reference minimum for ASTM A312 TP304L |
| Elongation — longitudinal specimen | 35% | Subject to applicable specimen / test rules |
| Elongation — transverse specimen | 25% | Subject to applicable specimen / test rules |
| Reference density | 7.90 g/cm³ | Used only for theoretical weight estimates |
| Heat-treated delivery | Required by ASTM A312 | Confirm treatment and final condition |
Values are common ASTM A312 TP304L pipe reference minima; elongation depends on test direction, specimen configuration and the ordered specification. Do not substitute ASTM A240 sheet/plate mechanical criteria for an A312 pipe purchase.
Select ASTM A312 TP304L seamless, straight-seam welded or permitted heavily cold-worked welded pipe to match your approved piping class.
Seamless pipe is manufactured without a longitudinal weld seam and is suitable for welded system fabrication when the pipe class permits it. Specify the required OD, wall tolerance, heat-treated condition and inspections for your pipe class.
ASTM A312 also covers straight-seam welded and heavily cold-worked welded forms. State the permitted weld route, post-production heat treatment, examination method and weld traceability in your order.
Choose stainless S-series wall schedules by NPS or state exact outside diameter and nominal wall thickness.
| NPS | OD (mm) | SCH 10S (mm) | SCH 40S (mm) | SCH 80S (mm) |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.11 | 2.77 | 3.73 |
| 1 | 33.4 | 2.77 | 3.38 | 4.55 |
| 2 | 60.3 | 2.77 | 3.91 | 5.54 |
| 3 | 88.9 | 3.05 | 5.49 | 7.62 |
| 4 | 114.3 | 3.05 | 6.02 | 8.56 |
| 6 | 168.3 | 3.40 | 7.11 | 10.97 |
| 8 | 219.1 | 3.76 | 8.18 | 12.70 |
| 10 | 273.1 | 4.19 | 9.27 | 12.70 |
| 12 | 323.9 | 4.57 | 9.53 | 12.70 |
Selected nominal values based on ASME B36.19-2022. S-series dimensions are specified separately from non-S schedule designations. Your project documents determine wall tolerance, corrosion allowance and pressure design.
Send your dimensioned pipe schedule for cut lengths, quantities and acceptance review.
The lower carbon level of TP304L reduces the tendency for chromium-carbide precipitation in weld heat-affected zones. It is commonly selected for welded pipe spools, industrial fabrication and service where intergranular corrosion after sensitization is a concern.
Choose real project or stainless pipe fabrication photographs that match the actual process.
A312 pipe is often procured with a mill or pickled surface, while mechanical polishing or designated surface roughness can be requested for selected applications.
For hygienic or pharmaceutical installations, confirm whether a separate hygienic tube standard, measured roughness or special cleaning documentation is specified.
Select TP304L for projects with welded assemblies and compatible process fluids, while confirming the full piping specification and corrosion conditions.
Fabricated process lines and field-welded assemblies where low-carbon TP304L is specified.
Pipe runs and equipment connections with defined cleaning chemistry and accepted finishes.
Piping on treatment systems selected after evaluating water chemistry and chloride exposure.
Industrial skids, vessels and transfer lines where the chemical service suits 304L.
Pipework connected to compatible heat-transfer equipment with suitable temperature design.
Bulk pipe supply, fixed-length cutting and grade-traceable distribution orders.
Include a tagged pipe schedule and all required inspection documents in a single RFQ.
Calculate nominal bare-pipe mass using 304L stainless density (7.90 g/cm³), pipe OD, wall, length and quantity.
Pick a common NPS and S-series wall schedule, or enter your own OD and nominal wall. Enter pipe length and piece quantity for your estimate.
The accepted manufacturing and post-production operations depend on seamless or welded TP304L pipe route and the order specification.
Company-wide steel operations, procurement coordination and document control can support buyers managing multiple pipe sizes and material specifications.
Specify TP304L, route, surface and certificates for each line item.
Reported 8 million MT annual company-wide steel output and 1 million MT regular inventory; TPTP304L availability is quoted separately.
Align heat records, MTC, testing and independent inspections when requested.
Discuss packaging, fixed lengths, shipment lots and destination-specific requirements.
Ask for documented S30403 heat chemistry, tensile properties, heat-treated state, dimensions and required pipe examination.
Examination and acceptance depend on the manufacturing route, pipe size, standard edition and supplemental purchase-order requirements.
Add cut lengths, weld-ready ends, surface cleaning or polishing to your TP304L quotation.
State exact length, tolerance and piece count by nominal pipe size.
Define square-cut or bevel geometry from the installation or welding drawings.
Confirm the final surface condition, finish designation and required cleanliness.
Ask for size, steel grade, heat references and shipment lot coding where needed.
Use clear line-item identification and cut lists to reduce receiving time.
Protect clean pipe bores and finished ends during shipment.
List the grade, weld route and required documentation for each line of the 304L pipe purchase order.
Maintain material traceability and protect pipe ends and surface finishes through export packing and delivery.
Provide delivery port, shipping terms and unloading conditions to receive a shipment-specific quote.
Compare carbon limit, weldability requirements and corrosion-service choices before approving a substitute grade.
| Grade | Procurement selection focus |
|---|---|
| 304L / TP304L | This page: low-carbon austenitic pipe for welded assemblies; A312 reference carbon maximum 0.035% |
| 304 / TP304 | General-purpose 18/8 austenitic pipe; A312 reference tensile/yield minima 515/205 MPa |
| 316L / TP316L | Molybdenum-bearing stainless option for selected chloride and chemical exposures |
| 2205 / UNS S32205 | Duplex stainless for higher design strength and selected corrosive conditions; often ASTM A790 |
Compare adjacent grades and product forms without confusing the ASTM product standard used in your project.
Send a combined BOQ and specify grade, dimensions, weld-route acceptance and inspection requirements separately for each item.
Grade chemistry, weldability, manufacturing methods, sizing, inspection and bulk purchasing.
TP304L is the low-carbon UNS S30403 austenitic stainless pipe grade specified under ASTM A312 for qualifying seamless, straight-seam welded and heavily cold-worked welded products.
304L has a lower carbon limit, which helps reduce sensitization and related intergranular corrosion risk in weld heat-affected zones. Welding procedure and fluid chemistry still matter.
Published ASTM A312 TP304L pipe tables use 0.035% maximum. Many general 304L or ASTM A240 sheet/plate references use 0.030%; specify 0.030% on the PO if required.
ASTM A312/A312M-25 is the current ASTM pipe specification identified for this page. The purchase order should identify the exact edition governing acceptance.
ASTM A312 includes seamless, welded and heavily cold-worked welded austenitic pipe forms. Confirm the allowed manufacturing route, required inspection and finishing for your pipe class.
Specify NPS and ASME B36.19 S-series wall thickness such as SCH 10S, 40S or 80S, or provide exact OD and nominal wall in millimeters.
Common ASTM A312 TP304L pipe reference minima are 485 MPa tensile strength and 170 MPa 0.2% yield strength. Confirm values and specimen requirements in the contract edition.
Low carbon principally addresses sensitization risk. It does not automatically improve pitting resistance versus 304; chloride concentration, temperature and crevices still require assessment.
Sometimes. A dual-certified pipe must satisfy the complete applicable chemistry, strength and product-standard requirements of both grades, supported by the MTC.
No. ASTM A312 covers qualifying stainless pipe for corrosive and elevated-temperature service; A269 is a separate specification for general-service austenitic stainless tubing.
Use the pipe annulus area, nominal OD and wall, length, quantity and 7.90 g/cm³ reference density. The on-page calculator gives nominal bare-steel mass only.
Send ASTM grade and edition, seamless or welded form, NPS / OD, schedule / WT, cut length, quantity, surface and end requirements, inspections, delivery destination and target date.
Submit your piping BOM with TP304L / S30403, accepted ASTM edition, pipe size, manufacturing route, end preparation and required inspection records. Our team will review specifications and delivery requirements for your quotation.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.
