GB 9948 Seamless Steel Pipes

High-quality Tubes For Petroleum Cracking And Refining

Gb 9948 seamless steel pipes, compliant with gb/t 9948-2013, are high-quality carbon and alloy steel tubes designed for petroleum cracking and refining processes, suitable for high-temperature and high-pressure petrochemical applications.

GB 9948 Seamless Steel Pipe Chinese Standard Petroleum Crack GB/T 9948-2013 Seamless Steel Tubes for Petroch +2 More

GB 9948 Seamless Steel Pipes

High-quality Tubes For Petroleum Cracking And Refining

GB 9948 Seamless Steel Pipe Chinese Standard Petroleum Crack GB/T 9948-2013 Seamless Steel Tubes for Petroch +2 More

GB 9948 seamless steel pipes, compliant with the Chinese national standard GB/T 9948-2013, are high-quality carbon and alloy steel tubes designed for petroleum cracking and refining processes. These pipes are engineered for high-temperature and high-pressure environments, making them ideal for applications in petroleum refineries, petrochemical plants, and cracking units.

Manufactured through hot-rolling (extrusion, expansion) or cold-drawing (rolling) processes, GB/T 9948 seamless pipes are available in outer diameters from 10 mm to 426 mm and wall thicknesses from 2.0 mm to 40 mm, as per GB/T 17395. Common steel grades include 10, 20, 12CrMo, 15CrMo, 1Cr5Mo, and 12Cr2Mo, with grade 20 being widely used for its excellent balance of strength, toughness, and weldability. These pipes are suitable for operating conditions with temperatures up to 600°C and pressures exceeding 10 MPa, such as in cracking furnaces, heat exchangers, and high-pressure pipelines.

GB 9948 pipes undergo rigorous testing, including hydraulic (up to 20 MPa), tensile, flattening, flaring, impact, ultrasonic, and eddy current tests, to ensure compliance with GB/T 9948-2013 standards. Surface treatments like varnishing, shot blasting, or anti-corrosion coatings enhance durability in aggressive petrochemical environments. The seamless construction ensures uniform strength and leak-proof performance, critical for maintaining safety and efficiency in petroleum cracking processes.

Compared to international standards like ASTM A335 or EN 10216-2, GB/T 9948 pipes are optimized for petroleum cracking applications, with grade 20 aligning closely with ASTM A106B for similar high-temperature uses. These pipes offer a cost-effective, high-performance solution for petrochemical industries, addressing challenges like thermal stress, corrosion, and high-pressure fluid transport. They are widely used in China and exported globally, particularly to regions like the Middle East and Southeast Asia, due to their reliability and adherence to strict standards.

GB 9948 seamless steel pipes are the preferred choice for engineers and manufacturers in petroleum refining, petrochemical processing, and cracking units, ensuring safe and efficient operation under extreme conditions.

GB 9948 Seamless Steel Pipes

GB/T 9948 Seamless Steel Tubes For Petroleum Cracking

GB/T 9948 standard is equivalent to ASTM A335, ASTM A312, etc.

it applies to seamless steel tubes used for furnace tubes, heat exchanger tubes, and pressure pipelines in petrochemicals. GB/T 9948 seamless steel tubes are made of high quality carbon steel or alloy steel materials, which have high strength and excellent mechanical properties. The carbon steel materials main include 10#, 20#. The alloy steel materials main include 12Cr5Mo, 12CrMo, etc. Different materials have different heat treatment process requirements. No matter what the material is used, we will perform heat treatment on the steel pipes before delivery.

Key Benefits

High-Temperature Resistance

Designed to withstand temperatures up to 600°C in cracking processes.

Cost-Effective

Durable seamless design reduces maintenance costs.

Versatile Applications

Ideal for petroleum cracking and petrochemical pipelines.

Corrosion Resistance

Coatings enhance durability in petrochemical environments.

Rigorous Testing

Hydraulic, ultrasonic, and impact tests ensure quality.

Seamless Design

Ensures uniform strength and leak-proof performance.

Technical Specifications

Chemical Composition of GB 9948 Seamless Steel Pipes
Grade	C (%)	Si (%)	Mn (%)	P (≤%)	S (≤%)	Cr (%)	Mo (%)	Ni (%)
10	0.07-0.14	0.17-0.37	0.35-0.65	0.035	0.035	≤0.15	—	≤0.25
20	0.17-0.24	0.17-0.37	0.35-0.65	0.035	0.035	≤0.25	—	≤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	≤0.30
1Cr2Mo	≤0.15	0.50-1.00	0.30-0.60	0.035	0.030	2.15-2.85	0.45-0.65	—
1Cr5Mo	≤0.15	≤0.50	≤0.60	0.035	0.030	4.00-6.00	0.45-0.60	≤0.60

Note:

GB 9948 is China's national standard for seamless steel pipes used in petroleum‑cracking applications, covering carbon, alloy, and stainless grades.
Typical grades include 10#, 20#, 12CrMo, and 07Cr19Ni10—designed for high‑temperature, high‑pressure, and corrosive service.
GB 9948 pipes are more specialized than ASTM A53/A106 or API 5L for cracking operations and offer enhanced corrosion resistance.

Mechanical Properties of GB 9948 Seamless Steel Pipes
Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Impact Energy (J)	Brinell Hardness (HB)	Delivery Status
10	330-490	≥205	≥24	—	—	Normalizing
20	410-550	≥245	≥21	≥39	—	Normalizing
15CrMo	440-640	≥235	≥21	≥47	≤170	Normalizing + tempering
1Cr2Mo	≥390	≥175	≥22	≥92	≤179	Normalizing + tempering
1Cr5Mo	≥390	≥195	≥22	≥92	≤187	Annealing

Comparison of GB/T 9948 20 with Other Standards
Feature	GB/T 9948 20	ASTM A335 P11	EN 10216-2 P265GH
Material Type	Carbon Steel (Seamless)	Alloy Steel (Seamless)	Carbon Steel (Seamless)
Temperature Range	Up to 600°C	Up to 600°C	Up to 450°C
Pressure Range	>10 MPa	High pressure	Moderate pressure
Corrosion Resistance	Good (With coatings)	Excellent	Good
Applications	Petroleum cracking, petrochemical	High-temperature boilers	Pressure systems, boilers
Tensile Strength (MPa)	410–550	≥415	410–570
Yield Strength (MPa)	245	≥205	265
Key Advantage	Optimized for petroleum cracking	Superior high-temperature strength	Precision for pressure systems

Heat Treatment Processes for GB 9948 Seamless Steel Pipes
Grade	Heat Treatment
10#	Normalization: Normalizing temperature 880℃-940℃
20#	Normalization: Normalizing temperature 880℃-940℃
12CrMo	Normalized and tempered: Normalizing temperature 900℃-960℃, tempering temperature 670℃-730℃
15CrMo	Normalized and tempered: Normalizing temperature 900℃-960℃, tempering temperature 680℃-730℃
12Cr5MoI	Full annealing or isothermal annealing

Steel Pipe Applications and Specification Parameters
Application	OD Range	WT Range	Length Range	Standards
Cracking Furnaces	10-426 mm	1.5-50 mm	5-12 m	GB/T 9948, ASTM A335, EN 10216-2
Heat Exchangers	1/2" – 12"	SCH 40, 80, 160	Up to 12 m	ASTM A213, A312, GB/T 9948
Transfer Lines	1/8" – 24"	SCH 40, 80, XXS	Up to 12 m	GB/T 9948, ASTM A335, GOST 9941
Refinery Piping	10-323 mm	1.5-40 mm	5-12 m	GB/T 9948, ASTM A106, EN 10216-2

You Can Also Search GB 9948 Seamless Steel Pipes by

A curated list of long-tail keywords for GB 9948 seamless steel pipes, covering specifications, applications, and material properties, presented in a multi-column layout.

Standards and Specifications

• GB/T 9948-2013 seamless steel pipe specifications
• GB 9948 petroleum cracking tube standards
• GB/T 9948 carbon steel pipe properties
• Chinese standard seamless cracking tube tolerances

Applications

• GB 9948 pipes for petroleum cracking
• GB/T 9948 seamless tubes for petrochemical pipelines
• GB 9948 tubes for cracking furnaces
• Chinese standard pipes for refining processes

Material and Grades

• GB/T 9948 20 carbon steel material
• GB 9948 pipe grades
• GB seamless cracking tube corrosion resistance

Manufacturing and Testing

• GB/T 9948 seamless pipe manufacturing process
• GB 9948 pipes hydraulic testing
• GB seamless pipe quality control

Procurement and Suppliers

• GB 9948 seamless steel pipes suppliers
• GB/T 9948 seamless pipe distributors
• Chinese standard cracking tubes price

Dimensions and Customization

• GB/T 9948 seamless pipe dimensions
• GB 9948 pipe tolerances
• GB seamless pipes custom lengths

Note: GB/T 9948-2013 covers seamless steel tubes for petroleum cracking. For detailed specifications, refer to the GB/T 9948-2013 standard or contact a certified supplier.

GB 9948 seamless steel pipes, under GB/T 9948-2013, are high-quality carbon and alloy steel tubes designed for petroleum cracking and refining processes, suitable for high-temperature and high-pressure petrochemical applications.

Common grades include 10, 20, 12CrMo, 15CrMo, 1Cr5Mo, and 12Cr2Mo, with grade 20 widely used for its strength, toughness, and weldability in petroleum cracking applications.

For 20:
- C: 0.17–0.24%; Si: 0.17–0.37%; Mn: 0.35–0.65%; P: ≤0.035%; S: ≤0.035%

For 20:
- Yield Strength: ≥245 MPa
- Tensile Strength: 410–550 MPa
- Elongation: ≥20%
- Impact Test (0°C): ≥35 J (for OD ≥76 mm, WT ≥14 mm)

Outer diameters: 10–426 mm; wall thicknesses: 2.0–40 mm; lengths: 6 m or custom. Tolerances: OD ±1%, wall thickness ±10% for cold-drawn, ±12.5% for hot-rolled.

Produced via hot-rolling (extrusion, expansion) or cold-drawing (rolling); delivered in heat-treated condition (e.g., normalizing at 880°C–940°C), with optional varnishing or anti-corrosion coatings.

Includes hydraulic (up to 20 MPa), tensile, flattening, flaring, impact, ultrasonic, and eddy current tests to ensure quality and compliance with GB/T 9948-2013 standards.

Used in petroleum cracking furnaces, petrochemical pipelines, heat exchangers, refinery equipment, and high-pressure fluid transport systems in chemical processing.

Marked with standard, grade, OD×WT, heat number, and manufacturer ID. Orders specify standard, grade, dimensions, length, and test certificates.

Common equivalents include:
- 20 ≈ ASTM A106B
- 15CrMo ≈ ASTM A335 P11
- 1Cr5Mo ≈ ASTM A335 P5

Grade 20 seamless pipe, equivalent to 20G in other GB standards, is a high-quality carbon structural steel used in petroleum cracking and refining, known for its strength, toughness, and weldability in high-temperature environments.

For 20:
- Chemical Composition: C 0.17–0.24%; Si 0.17–0.37%; Mn 0.35–0.65%; P ≤0.035%; S ≤0.035%
- Mechanical Properties: Yield Strength ≥245 MPa; Tensile Strength 410–550 MPa; Elongation ≥20%; Impact Test (0°C) ≥35 J (for OD ≥76 mm, WT ≥14 mm)

Grade 20 seamless pipes are used in petroleum cracking furnaces, petrochemical pipelines, heat exchangers, and high-pressure fluid transport systems due to their high-temperature strength and corrosion resistance.

Grade 20 is a carbon steel with good weldability and toughness, suitable for temperatures up to 600°C. 15CrMo, a low-alloy steel with chromium and molybdenum, offers superior high-temperature strength and corrosion resistance for more demanding petrochemical applications.

Grade 20 seamless pipes are manufactured via hot-rolling (extrusion, expansion) or cold-drawing (rolling), delivered in heat-treated condition (normalizing at 880°C–940°C), with optional varnishing or anti-corrosion coatings for enhanced durability.

Industrial Applications

GB/T 9948 seamless steel pipes are essential for petroleum cracking and refining processes, offering superior strength and thermal resistance.

Petroleum Cracking

Used in cracking furnaces for hydrocarbon processing.

Petrochemical Pipelines

Transports high-pressure fluids in refining processes.

Heat Exchangers

Facilitates heat transfer in petrochemical plants.

Refinery Equipment

Used in high-pressure refining units.

Chemical Processing

Supports corrosive fluid transport in chemical plants.

High-Pressure Pipelines

Ensures reliable fluid transport in petrochemical systems.

GB 9948 Seamless Steel Pipes

GB 9948 Seamless Steel Pipes

GB/T 9948 Seamless Steel Tubes For Petroleum Cracking