ASTM A333/A333M-24 | SEAMLESS | LOW-TEMPERATURE TOUGHNESS
TRACEABLE MATERIAL FOR LOW-TEMPERATURE PIPING
Source ASTM A333 Grade 6 seamless carbon steel pipe for engineered low-temperature piping. Share your pipe schedule, impact-test documentation, heat-treatment requirements and order tonnage to receive a tailored quotation.
Review low-temperature test requirements ↓Define material, dimensions, impact testing and inspection together—particularly for low-temperature service.
| Parameter | Procurement specification |
|---|---|
| Product designation | ASTM A333 Grade 6 Seamless Steel Pipe |
| Material specification | ASTM A333/A333M-24 (confirm contractual edition and unit system) |
| Pipe dimensional reference | ASME B36.10 for wrought-steel pipe nominal OD and schedule dimensions |
| Manufacturing route | Seamless; heat treatment and tests according to the ordered product standard |
| Impact temperature | −45°C (−50°F) standard Grade 6 reference; specimen rules may alter test temperature |
| Nominal pipe size | State NPS or actual OD in mm |
| Wall thickness / schedule | Actual specified WT, SCH 40 / SCH 80 or other verified schedule |
| Length options | Random, fixed or cut lengths subject to mill and order confirmation |
| End finish | Plain, beveled or specifically prepared ends |
| Surface | Mill finish / agreed protective coating and end caps |
| Heat treatment | Condition specified under ASTM A333/A333M and recorded in MTC |
| Test records | Heat analysis, tensile, low-temperature impact, hydro/NDE where applicable |
| Documentation | MTC, traceable heat number and inspection records per purchase order |
Nominal dimensions and availability depend on the mill, wall thickness, requested toughness testing and manufacturing route. Confirm all special requirements before pricing.
Buy to the Grade 6 material specification, not an unverified substitute based on strength alone.
| Property | Grade 6 minimum / requirement |
|---|---|
| Tensile strength, minimum | 415 MPa (60,000 psi) |
| Yield strength, minimum | 240 MPa (35,000 psi) |
| Elongation | Determine by actual wall thickness, gauge length, specimen type and test orientation under the contracted edition |
| Mandatory toughness | Charpy V-notch evaluation; see the impact section below |
| Application condition | Suitable material selection and allowable service temperature depend on the governing piping code |
For comparative procurement. Mechanical test results on the MTC determine the delivered heat's compliance. Elongation is wall- and specimen-dependent.
| Element | Grade 6 reference |
|---|---|
| Carbon (C) | ≤ 0.30% |
| Manganese (Mn) | 0.29–1.06%* |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.025% |
| Silicon (Si) | ≥ 0.10% |
| Nickel (Ni) | ≤ 0.40% |
| Chromium (Cr) | ≤ 0.30% |
| Copper (Cu) | ≤ 0.40% |
| Molybdenum (Mo) | ≤ 0.12% |
| Vanadium (V) | ≤ 0.08% |
| Niobium (Nb) | ≤ 0.02%** |
* ASTM permits a limited Mn increase when carbon is reduced below 0.30%, up to 1.35% maximum under the applicable rule. ** Specific purchaser/mill agreements may affect permitted niobium limits; apply the order's standard edition.
Understand what Grade 6 impact testing proves—and what depends on specimen size and the project design code.
Grade 6 is specified where notch toughness must be checked at low temperatures. Full-size test results alone do not describe every pipe wall: thinner walls may produce sub-size specimens that require different acceptance values and test-temperature adjustments.
Image slot for a real impact-testing or laboratory photo. A grade name alone does not constitute evidence of impact-test compliance.
| Impact-test item | Procurement / inspection note |
|---|---|
| Test temperature reference | −45°C (−50°F) for Grade 6; actual required temperature can be lower based on specimen geometry |
| Full-size Charpy V-notch (10 × 10 mm) | Average of three specimens ≥18 J (13 ft·lbf) |
| Minimum individual value (10 × 10 mm) | At least 14 J (10 ft·lbf) for one specimen |
| Sub-size specimens | Reduced acceptance energies and, where required, adjusted testing temperature under ASTM A333 tables |
| Report in material documentation | Impact test temperature; specimen dimensions and orientation; individual and average absorbed energies |
The numbers shown for full-size impact specimens are common ASTM A333 Grade 6 acceptance values. Apply the edition-specific sub-size and thin-wall provisions for the actual delivered pipe.
Send the lowest design metal temperature, size range, test-record requirements and any independent inspection scope.
Use dimensional tables for planning, then confirm the actual wall thickness, manufacturing range and test specimen availability.
Typical nominal pipe dimensions referenced from ASME B36.10. These are dimensional examples, not confirmed inventory or a complete available size list.
| Nominal pipe size | Outside diameter (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 |
Request actual OD and WT if your engineering drawing specifies dimensions rather than NPS and schedule.
Heat-treatment routes, pipe finishing and end preparation belong in the same procurement specification.
ASTM A333 Grade 6 requires an appropriate specified treatment to control microstructure. Normalizing is a recognized route; the acceptable condition depends on the standard and production method.
Request clean mill finish or an agreed protective coating, with caps and lifting protection as appropriate to the shipment.
Define weld-preparation dimensions, end squareness, protection and any customer-specific machining requirements.
Use low-temperature material requirements alongside the project piping code and operating conditions.
ASTM A333 Grade 6 is often selected for process pipework where reduced-temperature notch toughness must be verified. Specify the design minimum metal temperature, nominal size, wall, joint preparation, impact testing and documentation before purchasing material.
A333 Grade 6 is chosen where the full material specification and low-temperature inspection requirements are relevant.
Pipe spools and industrial process lines requiring a defined low-temperature toughness specification.
Selected energy and utility systems where the engineering specification calls for A333 Grade 6 material.
Plant piping and equipment connections in service conditions evaluated for low-temperature fracture resistance.
Cut, marked and beveled seamless pipe supplied for shop fabrication and controlled welding procedures.
Piping connected to process and refrigeration equipment, selected under the applicable construction code.
Long-form bills of materials with size, impact test, traceability and inspection requirements.
Send the exact grade, size, service conditions, code requirements and test records for specification review.
Select an NPS / Schedule or enter actual OD, wall and pipe length for a theoretical bare-pipe weight estimate.
The calculation uses 7.85 g/cm³ steel density and nominal OD / WT. It estimates bare, plain-end pipe mass; it excludes coating, end preparation, fittings, pallets and actual tolerances.
A333 Grade 6 procurement connects pipe production with documented low-temperature material acceptance.
Procurement support for specification review, mill coordination, quality records and export shipping.
Coordinate the steel grade, standard edition, schedule, test temperature and MTC package before confirming a quote.
Keep heat identification and inspection requirements visible from purchase order through shipment.
Work with a steel business reporting 8M MT annual output and 1M MT regular company-wide inventory; Grade 6 availability is confirmed separately.
Request the pipe length, lifting, end protection, package markings and destination terms needed for international delivery.
Our team can review your test and delivery requirements against available mill supply routes.
Ensure the heat number, treatment condition and impact-test results can be checked against the purchase order.
Specify pipe processing alongside test and traceability requirements so fabrication inputs are consistent.
Order planning depends on the combined pipe size range and required cold-temperature testing—not on grade name alone.
Grade 6 inventory and production lead times depend on size, wall, heat-treatment state and low-temperature test requirements. Share your project bill of materials for a quotation based on confirmed supply conditions.
Protect the edges, labels and material traceability through loading, transit and unloading.
Understand which material standard fits your application and inspection scope.
| Specification | Main material / product distinction | Common buyer focus |
|---|---|---|
| ASTM A333 Grade 6 | Low-temperature notch-toughness requirements; impact-test plan is central | This page |
| ASTM A106 Grade B | Seamless carbon steel pipe for high-temperature service | High-temperature process lines |
| ASTM A53 Grade B | General pipe applications with several permitted production types | General industrial pipe |
| API 5L Grade B / X52–X70 | Line-pipe products with PSL, chemistry, toughness and testing determined by API specification | Transmission pipeline projects |
| ASTM A252 Grade 3 | Steel pipe piles for construction and foundation work | Foundation piles |
ASTM A333 Grade 6 cannot be treated as an automatic substitution for A106, A53 or API 5L without an engineering and contractual review.
Compare pipe grade scopes before submitting a multi-grade project RFQ.
Focused answers for purchasing low-temperature seamless pipe to a defined inspection and delivery specification.
A carbon steel seamless pipe product specified under ASTM A333/A333M for low-temperature service and other uses requiring notch toughness. Seamless is the manufacturing route selected for this page.
ASTM A333/A333M-24 is the active edition identified by ASTM at the time of this page preparation. State the governing contract edition and confirm whether inch-pound or SI requirements apply.
−45°C (−50°F) is the standard Grade 6 reference. Thin-wall and sub-size Charpy specimen provisions can require temperature adjustments, so the actual test report and contract requirements control.
The minimum tensile strength is 415 MPa, and the minimum yield strength is 240 MPa. Elongation requirements depend on the prescribed test specimen and pipe wall thickness.
For a 10 × 10 mm V-notch specimen, a set of three is commonly evaluated against at least 18 J average, with no individual specimen below the applicable 14 J limit. Sub-size rules differ.
The Charpy test requirement is a material qualification condition. The project engineer must evaluate minimum design metal temperature, stress, wall, welded joints and the applicable piping or pressure code.
No. The materials serve different specified purposes. A333 includes low-temperature toughness requirements; A106 is specified for high-temperature seamless pipe. Substitution needs engineering approval.
These are commonly referenced dimensional schedules, but A333 Grade 6 availability depends on nominal size, wall thickness, mill capability, inspection scope and delivery window. Confirm each requested combination.
ASTM A333 sets requirements for controlling the microstructure and permits specified treatment routes. The actual Grade 6 pipe condition should be confirmed through the ordered edition and mill records.
Specify chemistry, tensile properties, impact test temperature / Charpy energies, hydrostatic or NDE requirements, heat-treatment record, dimensional checks and the requested MTC format.
It estimates bare-steel pipe mass from nominal OD, wall thickness, length and piece count using 7.85 g/cm³ steel density. The result excludes coatings and export packaging and is not a certified shipping weight.
Provide grade and standard edition, NPS or OD, SCH or wall, lengths and quantity, design/impact test requirements, surface and ends, MTC and third-party inspection needs, destination and delivery terms.
Send the pipe dimensions, Charpy impact requirements, heat-treatment and material-documentation expectations, quantity and destination. We will review the purchase specification and confirm quotation conditions.
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Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.
