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Help CenterGB/T 6479 Seamless Steel Tube for High-Pressure Chemical Fertilizer Equipment High Pressure Chemical Plants
Product Spotlights
High Pressure Chemical Plants – Synthetic Ammonia, Urea, Methanol
Grades 10, 20, 16Mn, 15CrMo, 1Cr5Mo, 12Cr2Mo
STANDARD NOW WITHDRAWN – Replaced by GB/T 9948-2025
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GB/T 6479 Seamless Steel Tube for High-Pressure Chemical Fertilizer Equipment
High Pressure Chemical Plants – Synthetic Ammonia, Urea, Methanol
Grades 10, 20, 16Mn, 15CrMo, 1Cr5Mo, 12Cr2Mo
STANDARD NOW WITHDRAWN – Replaced by GB/T 9948-2025
Product Overview
GB/T 6479 was the Chinese national standard for seamless steel tubes used in high-pressure chemical fertilizer equipment and high-pressure chemical piping systems. These tubes were specifically designed for severe service conditions including synthetic ammonia, urea, and methanol production.
▶ STANDARD STATUS – IMPORTANT ◀
Current status: GB/T 6479-2013 is WITHDRAWN / EFFECTIVE 2026-01-01
Replaced by: GB/T 9948-2025 "Seamless steel tubes for petrochemical and chemical facilities"
For new projects, we strongly recommend using GB/T 9948-2025
For legacy replacement projects, please specify GB/T 6479
Equipment Service Conditions:
Operating temperature: -40°C to 400°C
Operating pressure: 10 MPa to 32 MPa (100‑320 bar / 1,450‑4,640 PSI)
Media compatibility: Synthetic ammonia, urea, methanol, and other chemical media
Steel Grades Covered:
Carbon steel grades: 10, 20 (most popular for general service)
High strength carbon: 16Mn (Q345B equivalent) – low temperature capability down to -40°C
Chrome-molybdenum alloy: 15CrMo (1Cr-0.5Mo) – for elevated temperature
High chrome alloy: 1Cr5Mo – for H₂S + high temperature corrosion resistance
Chromium-molybdenum: 12Cr2Mo (2.25Cr-1Mo) – for high pressure thick-wall vessels
✅ GB/T 6479-2013 compliant – Provided for legacy and replacement projects only
✅ High pressure rated – Working pressure up to 32 MPa
✅ Low temperature capability – Impact tested down to -40°C (16Mn grade)
✅ Seamless construction – Hot rolled, cold drawn, or hot expanded
✅ Heat treated condition – Normalized, normalized + tempered, or quenched + tempered
✅ 100% NDT and hydrostatic tested – Guaranteed integrity
✅ Full traceability – EN 10204 Type 3.1 MTC provided
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| Standard | GB/T 6479-2013 (WITHDRAWN – replaced by GB/T 9948-2025) |
| Product Type | Seamless Steel Tube for High-Pressure Chemical Fertilizer Equipment |
| Service Conditions | Temperature: -40°C to 400°C; Pressure: 10‑32 MPa |
| Steel Grades | 10, 20, 16Mn, 10MoWVNb, 15CrMo, 1Cr5Mo, 12Cr2Mo |
| OD Range | 10mm – 426mm |
| Wall Thickness | 1.5mm – 40mm |
| Length | 4m – 12m (fixed or random) |
| Delivery Condition | Normalized, normalized + tempered, quenched + tempered |
| Surface Finish | Black / Bare / Oiled |
| End Finish | Plain / Beveled / Threaded |
💡 Legacy replacement users note: While GB/T 6479 has been replaced by GB/T 9948-2025, we supply to this withdrawn standard for existing plant maintenance and replacement projects .
Steel Grade Overview
| Grade | Type | Tensile (MPa) | Yield (MPa) | Elong (%) | Impact (J) / Temp | Application |
|---|---|---|---|---|---|---|
| 10 | Carbon steel | 335-490 | ≥205 | ≥24 | — | Low pressure general service |
| 20 | Carbon steel | 410-550 | ≥245 | ≥24 | ≥39 / 0°C | Standard service – most popular |
| 16Mn | High strength carbon | 490-670 | ≥320 | ≥21 | ≥47 / -40°C | Low temperature service (-40°C) |
| 15CrMo | Cr-Mo alloy | 440-640 | ≥235 | ≥21 | ≥47 | High temperature (400°C) + H₂ |
| 1Cr5Mo | 5%Cr-0.5%Mo alloy | 390-590 | ≥195 | ≥22 | ≥94 | Severe H₂ + H₂S + high temp |
| 12Cr2Mo | 2.25Cr-1Mo alloy | 450-600 | ≥280 | ≥20 | ≥38 | High pressure thick-wall vessels |
💡 Grade 20 is the most popular carbon steel grade for general synthetic ammonia and urea plant service. Grade 16Mn is specified for low temperature service down to -40°C with minimum 47J impact energy .
Critical Service Conditions for Chemical Fertilizer Equipment
| Requirement | Specification | Significance |
|---|---|---|
| High pressure rating | 10‑32 MPa working pressure | Synthetic ammonia synthesis loop pressure |
| Low temperature toughness | Impact tested down to -40°C (16Mn) | Cold climate and media handling |
| High temperature strength | Creep resistance up to 400°C | Methanation and shift conversion |
| H₂ / H₂S resistance | Low P/S limits + chrome alloy | Hydrogen attack + sulfide stress cracking |
| 100% NDT | UT or ET mandatory | Critical for pressure integrity |
Chemical Composition – GB/T 6479 Grades
| Grade | C (%) | Si (%) | Mn (%) | P max | S max | Cr (%) | Mo (%) |
|---|---|---|---|---|---|---|---|
| 10 | 0.07-0.14 | 0.17-0.37 | 0.35-0.65 | 0.030 | 0.030 | — | — |
| 20 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.030 | 0.030 | — | — |
| 16Mn | 0.12-0.20 | 0.20-0.60 | 1.20-1.60 | 0.030 | 0.030 | — | — |
| 15CrMo | 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | 0.030 | 0.030 | 0.80-1.10 | 0.40-0.55 |
| 1Cr5Mo | ≤0.15 | ≤0.50 | ≤0.60 | 0.030 | 0.030 | 4.00-6.00 | 0.45-0.60 |
| 12Cr2Mo | 0.08-0.15 | ≤0.50 | 0.40-0.70 | 0.030 | 0.030 | 2.00-2.50 | 0.90-1.20 |
GB/T 6479 vs GB/T 9948 – Standard Update
| Feature | GB/T 6479-2013 (Withdrawn) | GB/T 9948-2025 (Current) |
|---|---|---|
| Status | WITHDRAWN (Effective 2026-01-01) | Active |
| Scope | High-pressure fertilizer equipment | Petrochemical + chemical facilities |
| Grades | 10, 20, 16Mn, 10MoWVNb, 15CrMo, 1Cr5Mo, 12Cr2Mo | Extended range including stainless grades |
| Applications | Fertilizer plants | Petroleum refining + petrochemical |
| New projects | Not recommended | Recommended |
💡 Important: For all new projects after January 1, 2026, specify GB/T 9948-2025. We continue to supply GB/T 6479 material exclusively for legacy replacement and existing plant maintenance .
Applications – High-Pressure Chemical Fertilizer Facilities
| Application | Media | Recommended Grade | Service Conditions |
|---|---|---|---|
| Synthetic ammonia synthesis loop | NH₃ + H₂ | 20, 15CrMo | 20-32 MPa, 400°C |
| Urea synthesis | Urea + NH₃ + CO₂ | 20, 16Mn | 15-25 MPa, corrosive |
| Methanol synthesis | CH₃OH + CO | 20, 15CrMo | 10-20 MPa, 350°C |
| Shift conversion | CO + H₂O | 15CrMo | 400°C, H₂ rich |
| Ammonia refrigeration | NH₃ | 16Mn | -40°C low temp |
Quality Assurance & Testing
| Test | Method | Coverage | Critical for |
|---|---|---|---|
| Hydrostatic Test | Water pressure | 100% | Pressure integrity |
| Ultrasonic (UT) | Non-destructive | By agreement | Internal defects |
| Eddy Current (ET) | Non-destructive | By agreement | Surface defects |
| Tensile Test | EN ISO 6892-1 | Per lot | Strength verification |
| Charpy Impact | EN ISO 148-1 | Per lot | Low temp toughness |
| Flattening Test | Ductility | Per lot | Formability |
| Flaring Test | End expansion | Per lot | Tube end forming |
💡 GB 6479/GB 9948 standards have stricter manufacturing and testing requirements than GB/T 8163, including impact testing and low-temperature impact testing .
Why Choose Our GB/T 6479 Legacy Replacement Tubes?
| Advantage | Description |
|---|---|
| Legacy support | Supply to withdrawn standard for existing plant maintenance |
| Full grade range | 10, 20, 16Mn, 15CrMo, 1Cr5Mo, 12Cr2Mo – one-stop sourcing |
| 16Mn available | -40°C low temperature impact tested |
| 100% tested | Hydrostatic + NDT – per standard |
| Heat treated | Normalized or normalized + tempered |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Global export | Shipped to chemical fertilizer plants worldwide |
Contact for Quote
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: /
Reply within 24 hours.
FAQ – GB/T 6479
Q1: Is GB/T 6479 still valid?
A: No – GB/T 6479-2013 has been withdrawn and replaced by GB/T 9948-2025 effective January 1, 2026 . We supply GB/T 6479 only for legacy replacement projects.
Q2: What is the maximum pressure rating?
A: 10‑32 MPa (1,450‑4,640 PSI) .
Q3: What is the temperature range?
A: -40°C to 400°C – suitable for cold climate applications (16Mn grade) .
Q4: Which grade is used for low temperature service?
A: 16Mn – impact tested at -40°C with minimum 47J .
Q5: Which grade is recommended for high temperature hydrogen service?
A: 15CrMo (1Cr-0.5Mo alloy) – for service up to 400°C in hydrogen-rich environments.
Q6: Which grade resists H₂S + high temperature corrosion?
A: 1Cr5Mo (5% Chrome) .
Q7: What standard should I specify for new projects?
A: For new projects after January 1, 2026, specify GB/T 9948-2025 .
Related Products
GB/T 6479 – High-pressure fertilizer tubes (this product – withdrawn/legacy)
GB/T 9948 – Current standard (petrochemical + chemical facilities)
GB/T 5310 – High pressure boiler tubes
GB/T 8163 – Fluid transport tubes
Tags: GB/T 6479 Chemical Fertilizer Tube High Pressure Pipe Synthetic Ammonia Tube 16Mn Legacy Replacement
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