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Help CenterASME SA333 Seamless and Welded Steel Pipe For Low Temperature Service – Grades 1, 3, 4, 6, 7, 8, 9, 10, 11
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ASME SA333 Seamless and Welded Steel Pipe
For Low Temperature Service – Grades 1, 3, 4, 6, 7, 8, 9, 10, 11
Seamless or Electric-Resistance-Welded (ERW) – No Filler Metal Addition
ASME Boiler & Pressure Vessel Code Section II
Product Overview
ASME SA333 / ASTM A333 seamless and welded carbon and alloy steel pipe is specifically designed for low temperature service in accordance with the ASME Boiler and Pressure Vessel Code Section II. This specification covers nominal (average) wall pipe intended for use at low temperatures and in other applications requiring notch toughness.
Key manufacturing requirements:
Seamless process – Hot finished or cold drawn
Welding process – Electric-resistance-welded (ERW) with no filler metal addition during welding operation
Heat treatment – All pipes (seamless and welded) shall be treated to control their microstructure
Impact testing – Charpy V-notch testing mandatory for all grades at specified temperatures
Available Grades:
Grade 1 – Carbon steel, service down to -45°C (-50°F)
Grade 3 – 3.5% Nickel steel, service down to -100°C (-150°F)
Grade 4 – Low carbon steel, service down to -60°C (-75°F)
Grade 6 – Carbon steel, most popular grade, service down to -45°C (-50°F)
Grade 7 – 2.5% Nickel steel, service down to -75°C (-100°F)
Grade 8 – 9% Nickel steel, service down to -195°C (-320°F) – LNG standard
Grade 9 – 1.5% Nickel steel, service down to -75°C (-100°F)
Grade 10 – High strength carbon steel, service down to -45°C (-50°F)
Grade 11 – 36% Nickel steel, service down to -196°C (-321°F) – extreme cryogenic
✅ ASME SA333 certified – Compliant with ASME Boiler & Pressure Vessel Code Section II
✅ Seamless or ERW welded – Both options available under same specification
✅ No filler metal in welding – ERW process without filler metal addition
✅ Charpy impact tested – Guaranteed toughness at specified service temperature
✅ Full range of nickel grades – Grade 6 (-45°C), Grade 3 (-100°C), Grade 8 (-195°C)
✅ 100% hydrostatic and NDT tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC + Impact Report provided
✅ Factory direct | Stock available | Fast delivery
Key Specifications
| Parameter | Details |
|---|---|
| Standard | ASME SA333 / ASTM A333 |
| ASME Code | Boiler & Pressure Vessel Code Section II |
| Product Type | Seamless and Welded Carbon and Alloy Steel Pipe |
| Manufacturing | Seamless (hot finished/cold drawn) or ERW (no filler metal) |
| Grades | 1, 3, 4, 6, 7, 8, 9, 10, 11 |
| Size Range | 1/2″ – 24″+ (DN15 – DN600+) |
| Wall Thickness | Schedule 10 – Schedule 160 (2.0mm – 14mm+) |
| Length | 4m – 12m (fixed or random) – R1, R2, R3 available |
| Surface Finish | Black / Bare / Oiled / Galvanized |
| End Finish | Plain / Beveled / Threaded |
⚠️ Important Note: Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse effect on impact properties.
Welded Pipe Manufacturing – ASME SA333
| Feature | Requirement | Significance |
|---|---|---|
| Welding process | Electric-resistance-welded (ERW) | Consistent, high-quality weld seam |
| Filler metal | No filler metal addition | Prevents weld metal chemistry variation |
| Heat treatment after welding | Required (normalized or stress relieved) | Controls microstructure, ensures impact toughness |
| NDT of weld seam | 100% ultrasonic or eddy current | Detects weld seam defects |
| Impact testing | Required for base metal and weld seam | Verifies low temperature toughness |
💡 Both seamless and ERW welded pipe are fully accepted under ASME SA333 – the key requirement is proper heat treatment and impact testing for low temperature service.
Grades & Temperature Capability – Low Temperature Service
| Grade | Material Type | Min Service Temp | Impact Test Temp | Typical Application |
|---|---|---|---|---|
| Grade 1 | Carbon steel | -45°C (-50°F) | -45°C (-50°F) | General low temperature |
| Grade 3 | 3.5% Nickel | -100°C (-150°F) | -100°C (-150°F) | Medium cryogenic |
| Grade 4 | Low carbon | -60°C (-75°F) | -60°C (-75°F) | Moderate low temp |
| Grade 6 | Carbon steel | -45°C (-50°F) | -45°C (-50°F) | Most popular – best value |
| Grade 7 | 2.5% Nickel | -75°C (-100°F) | -75°C (-100°F) | Deeper low temp |
| Grade 8 | 9% Nickel | -195°C (-320°F) | -195°C (-320°F) | LNG / Liquid nitrogen |
| Grade 9 | 1.5% Nickel | -75°C (-100°F) | -75°C (-100°F) | Low temp vessels |
| Grade 10 | High strength carbon | -45°C (-50°F) | -45°C (-50°F) | Higher pressure low temp |
| Grade 11 | 36% Nickel | -196°C (-321°F) | -196°C (-321°F) | Extreme cryogenic |
💡 Grade 6 is the most economical for service down to -45°C. Grade 8 (9% Nickel) is the industry standard for LNG applications at -160°C to -195°C.
Chemical Composition – ASME SA333 Grades
| Grade | C max | Mn | P max | S max | Si | Ni | Others |
|---|---|---|---|---|---|---|---|
| Grade 1 | 0.30 | 0.40-1.06 | 0.025 | 0.025 | — | — | — |
| Grade 3 | 0.19 | 0.31-0.64 | 0.025 | 0.025 | 0.18-0.37 | 3.18-3.82 | — |
| Grade 4 | 0.12 | 0.50-1.05 | 0.025 | 0.025 | 0.18-0.37 | 0.47-0.98 | — |
| Grade 6 | 0.30 | 0.29-1.06 | 0.025 | 0.025 | ≥0.10 | — | — |
| Grade 7 | 0.19 | ≤0.90 | 0.025 | 0.025 | 0.13-0.32 | 2.03-2.57 | — |
| Grade 8 | 0.13 | ≤0.90 | 0.025 | 0.025 | 0.13-0.32 | 8.40-9.60 | — |
| Grade 9 | 0.20 | 0.40-1.06 | 0.025 | 0.025 | — | 1.60-2.24 | — |
| Grade 10 | 0.20 | 1.15-1.50 | 0.030 | 0.015 | 0.10-0.35 | ≤0.25 | — |
| Grade 11 | 0.10 | ≤0.60 | 0.025 | 0.025 | ≤0.35 | 35.0-37.0 | — |
💡 Nickel content is the key differentiator – higher nickel = lower allowable service temperature. Grade 8 (9% Ni) is required for LNG service at -195°C.
Mechanical Properties – ASME SA333 Grades
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness max |
|---|---|---|---|---|
| Grade 1 | ≥380 | ≥205 | ≥35 | — |
| Grade 3 | ≥450 | ≥240 | ≥30 | — |
| Grade 4 | ≥415 | ≥240 | ≥30 | — |
| Grade 6 | ≥415 | ≥240 | ≥30 | 89 HRB |
| Grade 7 | ≥450 | ≥240 | ≥30 | — |
| Grade 8 | ≥690 | ≥515 | ≥22 | — |
| Grade 9 | ≥435 | ≥315 | ≥28 | — |
| Grade 10 | ≥550 | ≥450 | ≥22 | — |
| Grade 11 | ≥690 | ≥515 | ≥18 | — |
💡 Grade 8 and Grade 11 have significantly higher strength (≥690 MPa) due to nickel alloying – suitable for higher pressure cryogenic service.
Low Temperature Charpy Impact Requirements
| Grade | Test Temp (°C) | Test Temp (°F) | Min Avg Energy (J) | Min Individual (J) |
|---|---|---|---|---|
| Grade 1 | -45 | -50 | 18 | 14 |
| Grade 3 | -100 | -150 | 18 | 14 |
| Grade 4 | -60 | -75 | 18 | 14 |
| Grade 6 | -45 | -50 | 18 | 14 |
| Grade 7 | -75 | -100 | 18 | 14 |
| Grade 8 | -195 | -320 | 20 | 16 |
| Grade 9 | -75 | -100 | 20 | 16 |
| Grade 10 | -45 | -50 | 20 | 16 |
| Grade 11 | -196 | -321 | 20 | 16 |
💡 Charpy impact testing is mandatory for all ASME SA333 grades – each heat treatment lot must be tested.
Key Advantages – Seamless and Welded Low Temperature Pipe
| Feature | Benefit |
|---|---|
| Seamless or welded options | Both fully accepted under ASME SA333 – choose based on application and cost |
| ERW welded with no filler metal | Consistent weld seam chemistry – no filler metal variation |
| Heat treated after welding | Stress relieved or normalized – ensures impact toughness |
| Charpy impact tested | Guaranteed toughness at service temperature – certified report provided |
| Nickel alloy grades | Grade 3 (3.5% Ni), Grade 8 (9% Ni), Grade 11 (36% Ni) for extreme low temp |
| Wide size range | 1/2″ to 24″+ – one-stop sourcing for low temperature piping |
| 100% NDT tested | UT or eddy current on weld seam (welded pipe) and base material |
| Grade 6 most economical | Best value for -45°C service – most popular for general low temp |
| Grade 8 LNG standard | Industry standard for LNG transfer lines at -160°C to -195°C |
| Full traceability | EN 10204 3.1 MTC + Impact Report with heat number |
Seamless vs Welded – Selection Guide for ASME SA333
| Feature | Seamless Pipe | Welded (ERW) Pipe |
|---|---|---|
| Manufacturing | Hot finished or cold drawn | Electric-resistance-welded, no filler metal |
| Size availability | 1/2″ – 24″ standard | 1/2″ – 24″ standard |
| Weld seam | No weld seam | Heat treated weld seam (normalized) |
| Cost | Higher | Lower |
| Lead time | Longer | Faster |
| Best application | High pressure, critical service | General low temperature service |
| Both accepted under ASME SA333 | Yes – fully compliant | Yes – fully compliant |
💡 Welded pipe is fully accepted under ASME SA333 – provided it is ERW with no filler metal and properly heat treated.
Applications – Low Temperature Service
| Industry | Application | Recommended Grade | Pipe Type |
|---|---|---|---|
| LNG Terminals | Cryogenic transfer lines | Grade 8 | Seamless or Welded |
| Air Separation Units | Liquid O2/N2/Ar piping | Grade 8 | Seamless or Welded |
| Petrochemical | Refrigeration systems, cold boxes | Grade 3, Grade 6 | Welded (economical) |
| Offshore Platforms | Arctic environment pipelines | Grade 3, Grade 6 | Seamless or Welded |
| Cold Climate Pipelines | Northern gas pipelines | Grade 6 | Welded (economical) |
| Cryogenic Storage | Liquid nitrogen, liquid oxygen | Grade 8, Grade 11 | Seamless |
| Refineries | Low temperature process piping | Grade 1, Grade 6 | Welded |
| Power Generation | Cold reheat lines | Grade 1, Grade 6 | Welded |
💡 Welded pipe is often preferred for non-critical low temperature applications due to lower cost and faster delivery.
Heat Treatment Requirements – ASME SA333
| Pipe Type | Heat Treatment Required | Purpose |
|---|---|---|
| Seamless – all grades | Normalized or stress relieved | Control microstructure, ensure impact toughness |
| Welded (ERW) – all grades | Normalized after welding | Stress relieve weld seam, ensure uniform impact properties |
| Grade 8 (9% Ni) | Quenched and tempered or double normalized and tempered | Achieve proper microstructure for -195°C service |
⚠️ Heat treatment after welding is mandatory for ERW pipe – normalized condition is required for low temperature impact properties.
Quality Testing & Inspection – ASME SA333 Pipe
| Test | Method | Coverage | Importance |
|---|---|---|---|
| Charpy Impact Test | ASTM E23 | Per heat treatment lot | CRITICAL – verifies low temp toughness |
| Hydrostatic Test | Water pressure | 100% | Pressure integrity |
| Ultrasonic (UT) – Seamless | ASTM E213 | 100% | Internal defect detection |
| NDT – Welded (ERW) | UT or eddy current | 100% of weld seam | Weld seam integrity |
| Tensile Test | ASTM E8 | Per heat | Strength verification |
| Hardness Test | Rockwell B/C | Per batch | Grade control |
| Flattening Test | ASME SA333 | Per lot | Ductility verification |
| Dimensional Inspection | Micrometer | 100% | Size verification |
💡 For welded pipe, 100% NDT of the weld seam is required to ensure no defects that could initiate brittle fracture at low temperature.
Welding Recommendations for Field Installation
| Grade | Preheat Required | PWHT Required | Low Hydrogen Required | Filler Metal Recommendation |
|---|---|---|---|---|
| Grade 1, 4, 6, 10 | Not required | Not required | Recommended | ER70S-2, E7018 |
| Grade 3 (3.5% Ni) | Required (120°C min) | Required | Required | ER80S-Ni1 |
| Grade 7, 9 (1.5-2.5% Ni) | Required (95°C min) | Required | Required | ER80S-Ni1 |
| Grade 8 (9% Ni) | Required (120°C min) | Required | Required | ENiCrFe-9, ERNiCrMo-3 |
| Grade 11 (36% Ni) | Optional | Not required | Required | ERNiFeCr-1 |
⚠️ Nickel alloy grades require preheat, PWHT, and low hydrogen practices – failure to follow proper procedures can cause cracking.
Mill Test Certificate – Low Temperature Pipe
ASME SA333 Certificate of Compliance – Standard
EN 10204 Type 3.1 MTC – Provided with heat number
EN 10204 Type 3.2 – Available upon request (third-party: SGS, BV, TUV, DNV)
Low Temperature Impact Test Report – Included (Charpy values at specified temperature)
Weld seam NDT report – For welded pipe (UT or eddy current)
Traceability: Full traceability from melt to finished pipe (heat number → pipe)
Packaging & Shipping – Low Temperature Pipe
| Item | Details |
|---|---|
| Packaging | Hexagonal bundles (small OD) or single pieces (large OD) |
| Protection | Anti-rust oil + plastic end caps |
| Marking | Stencil/spray with Grade, size, heat number, ASME SA333, impact test date |
| Documentation | MTC + Impact Report included |
| Lead time | 7–15 days (stock Grade 6), 20–35 days (Grade 3, 7), 30–45 days (Grade 8, 11) |
| Port | Tianjin / Shanghai / Guangzhou |
Why Choose Our ASME SA333 Low Temperature Pipe?
| Advantage | Description |
|---|---|
| Both seamless and ERW welded | Full range of manufacturing options under one specification |
| ERW with no filler metal | Properly heat treated – meets all ASME SA333 requirements |
| Cryogenic specialist | Dedicated line for low temperature grades (Grade 6, Grade 3, Grade 8, Grade 11) |
| In-house impact testing | Cooling tanks from 0°C to -196°C – Charpy impact testing verified |
| Full traceability | EN 10204 3.1 MTC + Impact Report with heat number |
| 100% NDT tested | Hydrostatic + UT (seamless) or weld seam NDT (ERW) |
| Grade 6 in stock | Most popular grade for -45°C service – ready to ship |
| Grade 8 available | 9% Nickel – industry standard for LNG projects |
| Nickel alloy preparation | Preheating, PWHT procedures available |
| Global export | Shipped to LNG and cryogenic projects worldwide |
| Flexible MOQ | Small orders accepted for Grade 6 stock sizes |
Contact for Quote – ASME SA333 Low Temperature Pipe
Please provide the following details for your low temperature piping project:
Grade : 1 / 3 / 4 / 6 / 7 / 8 / 9 / 10 / 11
Manufacturing : Seamless / Welded (ERW)
Size (NPS) : _______
Schedule / WT : _______
Length : _______ (m / ft)
Quantity : _______ (m / tons / pieces)
Service Temperature : _______ °C
Impact Test Temperature : _______ °C (if different)
End Finish : Plain / Beveled / Threaded
Inspection : Standard / Third-party (SGS/BV/TUV/DNV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website:
Reply within 24 hours.
FAQ – ASME SA333 Seamless and Welded Low Temperature Pipe
Q1: Is ASME SA333 available as welded pipe?
A: YES – ASME SA333 covers both seamless and welded (electric-resistance-welded, ERW) carbon and alloy steel pipe for low temperature service.
Q2: What is the filler metal requirement for welded pipe?
A: Welded pipe shall be made by the welding process with the addition of no filler metal in the welding operation.
Q3: Does welded pipe require heat treatment for low temperature service?
A: YES – All welded pipe shall be heat treated after welding (normalized or stress relieved) to control microstructure and ensure impact toughness.
Q4: What is the most popular grade for low temperature service?
A: Grade 6 – carbon steel, economical, suitable for -45°C service. Most widely used for non-cryogenic low temperature applications.
Q5: What grade is used for LNG service?
A: Grade 8 (9% Nickel steel) – industry standard for LNG transfer lines and storage at -160°C to -195°C.
Q6: Does ASME SA333 require impact testing?
A: YES – Charpy V-notch impact testing is mandatory for all ASME SA333 grades at the specified temperature for each grade.
Q7: What is the difference between seamless and welded ASME SA333 pipe?
A: Seamless – no weld seam, higher cost, preferred for high pressure critical service. Welded – ERW with no filler metal, heat treated, lower cost, suitable for many low temperature applications.
Q8: What is the maximum size available for welded ASME SA333 pipe?
A: Standard size range for both seamless and welded: 1/2″ to 24″ (DN15 – DN600+). Larger sizes may be available on request.
Q9: What filler metal is recommended for welding Grade 6?
A: ER70S-2 or E7018 can pass impact testing at -50°F when properly welded. ER80S-Ni1 (1% nickel) is more conventional and provides higher impact toughness for low temperature applications.
Q10: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, DNV, or any customer-specified agency.
Q11: Do you offer free samples?
A: 30cm sample of Grade 6 available (seamless or welded). Grade 8 samples available on request. Shipping fee applies.
Related Products – Low Temperature Piping Systems
ASME SA333 – Low temperature pipe – seamless and welded (this product)
ASME SA334 – Low temperature tube (small diameters, heat exchangers)
ASME SA350 – Low temperature flanges (LF1, LF2, LF3, LF5)
ASME SA420 – Low temperature pipe fittings (WPL6, WPL9, WPL3)
ASME SA320 – Low temperature fasteners (L7, L7A, L7M, B8)
Tags: ASME SA333 Low Temperature Pipe Seamless Pipe Welded Pipe ERW Pipe Cryogenic Pipe Grade 6 Grade 8 LNG Pipe ASME Code
Quick Reference – ASME SA333 Grade Selection
| Service Temp | Grade | Product Form | Nickel % | Cost |
|---|---|---|---|---|
| -45°C (-50°F) | Grade 6 | Seamless or Welded | 0% | $ |
| -60°C (-75°F) | Grade 4 | Seamless or Welded | 0% | $ |
| -75°C (-100°F) | Grade 7, 9 | Seamless or Welded | 1.5-2.5% | $$ |
| -100°C (-150°F) | Grade 3 | Seamless or Welded | 3.5% | $$$ |
| -195°C (-320°F) | Grade 8 | Seamless or Welded | 9% | $$$$ |
| -196°C (-321°F) | Grade 11 | Seamless only | 36% | $$$$$ |
Comparison – Seamless vs Welded ASME SA333 Pipe
| Feature | Seamless | Welded (ERW) |
|---|---|---|
| Standard coverage | Yes | Yes |
| Manufacturing | Hot finished/cold drawn | ERW, no filler metal |
| Heat treatment | Normalized | Normalized after welding |
| NDT requirement | 100% UT | 100% weld seam NDT |
| Impact testing | Required | Required |
| Cost | Higher | Lower |
| Best for | Critical high pressure | General low temperature service |
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