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Help CenterGB/T 9948 Seamless Steel Tube for Petrochemical & Refining Petroleum Cracking – Furnace Tubes, Heat Exchangers, High Pressure Piping
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Petroleum Cracking – Furnace Tubes, Heat Exchangers, High Pressure Piping
Grades 10, 20, 15CrMo, 1Cr5Mo
Current Standard: GB/T 9948-2025
1Cr5Mo: ≥390 MPa tensile | ≥195 MPa yield | ≥22% elong | ≥92J impact [citation:2]
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GB/T 9948 Seamless Steel Tube for Petrochemical & Refining
Petroleum Cracking – Furnace Tubes, Heat Exchangers, High Pressure Piping
Grades 10, 20, 15CrMo, 1Cr5Mo
Current Standard: GB/T 9948-2025
Product Overview
GB/T 9948 is the Chinese national standard for seamless steel tubes used in petrochemical and chemical refining facilities. This standard covers petroleum cracking tubes, high-pressure fertilizer equipment tubes, high-pressure polyethylene alloy steel tubes, and stainless steel furnace tubes for hydrogenation units .
These tubes are specifically designed for severe service conditions including:
Furnace tubes (cracking tubes) – Petroleum refining cracking furnaces
Heat exchanger tubes – Shell and tube heat exchangers in refineries
Pressure piping systems – High temperature, high pressure, and corrosive media transport
Standard Update – Important:
Previous standard: GB/T 9948-2013
Current standard: GB/T 9948-2025 (published 2025-06-30, effective 2026-01-01)
Scope extended: Now covers seamless tubes for petrochemical cracking, high-pressure fertilizer equipment, high-pressure polyethylene alloy steel tubes, and stainless steel furnace tubes for hydrogenation units
✅ GB/T 9948-2025 compliant – Current standard (effective January 1, 2026)
✅ High temperature strength – Excellent creep resistance for furnace service
✅ Seamless construction – Hot rolled, cold drawn, or hot expanded
✅ Heat treated condition – Normalized, normalized + tempered, or annealed
✅ 100% NDT and hydrostatic tested – Guaranteed integrity
✅ Sour service compatibility – Low P/S limits for H₂S resistance
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| Standard | GB/T 9948-2025 (effective 2026-01-01, supersedes GB/T 9948-2013) |
| Product Type | Seamless Steel Tube for Petrochemical and Refining Facilities |
| Steel Grades | 10, 20 (carbon); 15CrMo, 1Cr2Mo, 1Cr5Mo (alloy) |
| OD Range (Hot rolled) | 22mm – 530mm |
| OD Range (Cold drawn) | 6mm – 108mm |
| Wall Thickness | 2.0mm – 40mm |
| Length | 4m – 12m (fixed or random) |
| Delivery Condition | Normalized, normalized + tempered, quenched + tempered, annealed |
| Surface Finish | Black / Bare / Oiled |
| End Finish | Plain / Beveled |
Steel Grade Overview
| Grade | Type | Tensile (MPa) | Yield (MPa) | Elongation (%) | Impact (J) | Max Temp | Application |
|---|---|---|---|---|---|---|---|
| 10 | Carbon steel | 330-490 | ≥205 | ≥24 | — | 400°C | Low pressure service |
| 20 | Carbon steel | 410-550 | ≥245 | ≥21 | ≥39 | 450°C | Standard service – most popular |
| 15CrMo | Cr-Mo alloy | 440-640 | ≥235 | ≥21 | ≥47 | 550°C | High temperature furnace tubes |
| 1Cr2Mo | Cr-Mo alloy | ≥390 | ≥175 | ≥22 | ≥92 | 550°C | Heavy wall pressure piping |
| 1Cr5Mo | Cr-Mo alloy (5Cr) | ≥390 | ≥195 | ≥22 | ≥92 | 600°C | High oxidation resistance; furnace tubes |
💡 20# is the most popular carbon steel grade – used for general furnace and heat exchanger service. 15CrMo is the most popular alloy grade – widely used for high temperature furnace tubes .
Chemical Composition – GB/T 9948 Grades
| Grade | C (%) | Si (%) | Mn (%) | P max (%) | S max (%) | Cr (%) | Mo (%) |
|---|---|---|---|---|---|---|---|
| 10 | 0.07-0.14 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | ≤0.15 | — |
| 20 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 | ≤0.25 | — |
| 15CrMo | 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | 0.035 | 0.035 | 0.80-1.10 | 0.40-0.55 |
| 1Cr5Mo | ≤0.15 | ≤0.50 | 0.30-0.60 | 0.030 | 0.030 | 4.00-6.00 | 0.45-0.60 |
💡 Lower phosphorus and sulfur limits for alloy grades – improves H₂S resistance and high temperature toughness.
Applications – Petroleum Refining and Petrochemical Facilities
| Industry | Application | Recommended Grade | Service Conditions |
|---|---|---|---|
| Petroleum Refining | Cracking furnace tubes | 15CrMo, 1Cr5Mo | 500-600°C, coke formation |
| Petroleum Refining | Heat exchanger tubes | 20, 15CrMo | 400-550°C, corrosive media |
| Petrochemical | Furnace convection section | 20 | 450°C |
| Hydrocracking | Reactor effluent piping | 1Cr5Mo | H₂S + high temperature |
| Hydrotreating | Process piping | 15CrMo, 1Cr2Mo | H₂S + high pressure |
| Catalytic Cracking | Regenerator lines | 1Cr5Mo | High temperature + erosion |
💡 Furnace tubes (radiant section) require 15CrMo or 1Cr5Mo – carbon steel is only used in convection sections below 450°C.
Available Sizes – GB/T 9948
| OD (mm) | WT Range (mm) | Typical Grade | Application |
|---|---|---|---|
| 22 – 89 | 2.0 – 8.0 | 20 | Small furnace tubes |
| 89 – 159 | 3.0 – 12.0 | 20, 15CrMo | Furnace sections – most common |
| 159 – 273 | 4.0 – 20.0 | 15CrMo, 1Cr5Mo | Radiant furnace tubes |
| 273 – 426 | 5.0 – 30.0 | 1Cr5Mo, 1Cr2Mo | Transfer lines, headers |
| 426 – 530 | 6.0 – 40.0 | 1Cr5Mo | Heavy wall piping |
Quality Assurance & Testing
| Test | Method | Coverage | Importance |
|---|---|---|---|
| Hydrostatic Test | Water pressure | 100% | Mandatory |
| Ultrasonic (UT) | Non-destructive | By agreement | Internal defect detection |
| Eddy Current (ET) | Non-destructive | By agreement | Surface defect detection |
| Tensile Test | EN ISO 6892-1 | Per lot | Strength verification |
| Charpy Impact Test | EN ISO 148-1 | Per lot | Grades 20 and above |
| Flattening Test | Ductility | Per lot | Deformation capability |
| Flaring Test | Tube end expansion | Per lot | Tube end forming |
💡 Hydrostatic testing is mandatory – GB 9948/GB 6479 standards require stricter manufacturing and testing than GB/T 8163 .
Why Choose Our GB/T 9948 Petrochemical Tubes?
| Advantage | Description |
|---|---|
| Current standard | GB/T 9948-2025 – fully compliant |
| Full grade range | 10, 20, 15CrMo, 1Cr2Mo, 1Cr5Mo – one-stop sourcing |
| 20# in stock | Most popular grade – ready to ship |
| 100% hydrostatic tested | Mandatory per standard |
| High temperature certified | Furnace tube performance – creep strength verified |
| Low P/S for H₂S service | Meets sour service requirements |
| Heat treated condition | Properly normalized + tempered for alloy grades |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Global export | Shipped to refineries and petrochemical plants worldwide |
Contact for Quote
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: /
Reply within 24 hours.
FAQ – GB/T 9948
Q1: What is the current version of GB/T 9948?
A: GB/T 9948-2025 (published June 30, 2025, effective January 1, 2026), superseding GB/T 9948-2013 .
Q2: What is the most popular grade in GB/T 9948?
A: 20# for carbon steel service. 15CrMo for alloy steel service – widely used for furnace tubes in high temperature service .
Q3: What is 15CrMo used for?
A: 1% Chrome-0.5% Molybdenum alloy – widely used for furnace tubes in high temperature (>450°C) and high pressure service .
Q4: What is 1Cr5Mo used for?
A: 5% Chrome-0.5% Molybdenum alloy – used for severe high temperature, high oxidation resistance, and H₂S environments .
Q5: How does GB/T 9948 compare to GB/T 8163?
A: GB/T 9948 has stricter manufacturing and testing requirements, is suitable for higher temperatures and pressures, and uses electric furnace smelting with less impurities .
Q6: Does GB/T 9948 require impact testing?
A: Yes – for grades 20 and above, Charpy impact testing is required .
Q7: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, or any customer-specified agency.
Related Products
GB/T 9948 – Petrochemical cracking tubes (this product)
GB/T 6479 – High pressure fertilizer tubes
GB/T 5310 – High pressure boiler tubes
GB/T 8163 – Fluid transport tubes
Tags: GB/T 9948 Petrochemical Tube Petroleum Cracking Tube 15CrMo 1Cr5Mo Furnace Tube Seamless Steel Pipe
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