ASTM A334 Grade 6 & Grade 1 Seamless Low Temperature Tube Supplier
For Cryogenic & Low Temperature Service – OD 6~204mm | WT 1~18mm
Product Overview
Our ASTM A334 / ASME SA334 seamless low temperature tubes are manufactured in both Grade 6 and Grade 1 for service down to -45°C (-50°F). These tubes are designed for heat exchangers, condensers, and small-bore piping in cold climate, refrigeration, and petrochemical applications.
Key Specifications:
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Standard: ASTM A334 / ASME SA334
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Wall Type: Minimum wall thickness (no negative deviation)
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Grades: Grade 6 (Most popular – carbon steel, higher strength), Grade 1 (Standard carbon steel)
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Outer Diameter: 6mm – 204mm (Standard Stock: 19mm – 89mm)
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Wall Thickness: 1mm – 18mm
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Length: 3m – 12m (Custom lengths available)
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Manufacturing Process: Cold Drawn (Seamless)
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Tested: Charpy impact tested at -45°C
✅ ASME SA334 certified – Compliant with ASME Boiler & Pressure Vessel Code Section II
✅ Seamless cold drawn – No weld seam – eliminates brittle fracture risk at low temperature
✅ Charpy impact tested – Guaranteed toughness at -45°C – certified report provided
✅ Minimum wall thickness – No negative deviation – consistent tube integrity
✅ Grade 6 most economical – Best value for -45°C service
✅ 100% hydrostatic & NDT tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC + Impact Report provided
✅ Factory direct – Competitive pricing and fast delivery
Grade Selection – Low Temperature Service
| Grade | Service Temp | Impact Test Temp | Material Type | Tensile (MPa) | Yield (MPa) |
|---|---|---|---|---|---|
| Grade 1 | -45°C (-50°F) | -45°C | Carbon steel | ≥380 | ≥205 |
| Grade 6 | -45°C (-50°F) | -45°C | Carbon steel | ≥415 | ≥240 |
💡 Grade 6 is preferred for most applications – it offers higher strength (≥415 MPa tensile) compared to Grade 1 (≥380 MPa) at the same service temperature.
Chemical Composition
| Grade | C max | Mn | P max | S max | Si |
|---|---|---|---|---|---|
| Grade 1 | 0.30 | 0.40-1.06 | 0.025 | 0.025 | — |
| Grade 6 | 0.30 | 0.29-1.06 | 0.025 | 0.025 | ≥0.10 |
📌 Note for Grade 1: Each reduction of 0.01% carbon below 0.30% permits an increase of manganese of 0.05% above 1.06%, up to a maximum of 1.35%.
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| Grade 1 | ≥380 | ≥205 | ≥35 |
| Grade 6 | ≥415 | ≥240 | ≥30 |
Low Temperature Charpy Impact Requirements
| Grade | Test Temp (°C) | Min Avg Energy (J) | Min Individual (J) |
|---|---|---|---|
| Grade 1 | -45 | 18 | 14 |
| Grade 6 | -45 | 18 | 14 |
💡 Charpy impact testing is mandatory for both Grade 1 and Grade 6 at -45°C – certified report provided with every shipment.
Manufacturing Process – Cold Drawing with Low Temperature Toughness
Cold Drawing Process for Low Temperature Service:
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Hot rolled tubes are pickled to remove scale
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Cold drawing precisely reduces the diameter
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Heat treatment (normalizing or stress relieving) – ensures fine grain structure for low temperature toughness
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Straightening – ensures dimensional consistency
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Precision cutting – to exact length
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100% NDT and hydrostatic testing – guarantees integrity
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Charpy impact testing at -45°C – verifies low temperature toughness
Grade Comparison – Grade 1 vs Grade 6
| Feature | Grade 1 | Grade 6 |
|---|---|---|
| Tensile Strength | ≥380 MPa | ≥415 MPa (higher) |
| Yield Strength | ≥205 MPa | ≥240 MPa (higher) |
| Manganese Content | 0.40-1.06% | 0.29-1.06% |
| Silicon Content | Not specified | ≥0.10% |
| Typical Use | General low temp | Most popular – higher strength |
💡 Grade 6 offers 17% higher tensile strength than Grade 1 – preferred for most low temperature applications where higher strength is beneficial.
Key Applications – Low Temperature Service
| Industry | Application | Recommended Grade | Service Temp |
|---|---|---|---|
| Petrochemical | Low temperature heat exchangers | Grade 6 | -45°C |
| Refrigeration | Ammonia chillers | Grade 6 | -40°C |
| Industrial | Cold climate process equipment | Grade 6 | -45°C |
| Instrumentation | Low temperature sensing lines | Grade 1 | -45°C |
| Chemical | Low temperature process piping | Grade 6 | -45°C |
💡 Grade 6 is the preferred choice for most low temperature heat exchanger applications due to its higher strength and widespread availability.
Why Choose Our ASTM A334 Low Temperature Tubes?
| Advantage | Description |
|---|---|
| Low temperature specialist | Dedicated line for low temperature grades |
| Grade 6 in stock | Most popular grade – ready to ship |
| Charpy impact tested | Certified test reports at -45°C |
| Minimum wall thickness | No negative deviation – consistent integrity |
| Cold drawn precision | Tight tolerances – ideal for heat exchangers |
| Full traceability | EN 10204 3.1 MTC + Impact Report |
| Wide size range | OD 6-204mm – one-stop sourcing |
Contact for Quote
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: www.hzhmetals.com / www.wuxihengzhihui.com
Contact Person: Alice Yuan
Reply within 24 hours.
Tags: ASTM A334 Low Temperature Tube Grade 6 Tube Grade 1 Tube Cryogenic Tube Seamless Tube ASME SA334
