GB 6479 Seamless Steel Pipes

High-quality Tubes For High-pressure Chemical Fertilizer Equipment

Gb 6479 seamless steel pipes, compliant with gb/t 6479-2013, are high-quality carbon and alloy steel tubes designed for high-pressure chemical fertilizer equipment and pipelines, suitable for temperatures from -40°c to 400°c and pressures from 10 to 30 mpa.

GB 6479 Seamless Steel Pipe Chinese Standard High-Pressure F GB/T 6479-2013 Seamless Steel Tubes for Chemica +1 More

GB 6479 Seamless Steel Pipes

High-quality Tubes For High-pressure Chemical Fertilizer Equipment

GB 6479 Seamless Steel Pipe Chinese Standard High-Pressure F GB/T 6479-2013 Seamless Steel Tubes for Chemica +1 More

GB 6479 seamless steel pipes, compliant with the Chinese national standard GB/T 6479-2013, are high-quality carbon and alloy steel tubes designed for high-pressure chemical fertilizer equipment and pipelines. These pipes are engineered for demanding conditions, operating at temperatures from -40°C to 400°C and pressures from 10 to 30 MPa, making them ideal for fertilizer production, chemical processing, and petrochemical industries.

Manufactured through hot-rolling (extrusion, expansion) or cold-drawing (rolling) processes, GB/T 6479 seamless pipes are available in outer diameters from 16 mm to 168 mm and wall thicknesses from 2.0 mm to 30 mm, as per GB/T 17395. Common steel grades include 10#, 20#, Q345B/C/D/E, 12CrMo, 15CrMo, 12Cr2Mo, 12Cr5Mo, and 10MoWVNb, with 20# being widely used for its excellent toughness, weldability, and cost-effectiveness. These pipes are suitable for high-pressure applications such as urea reactors, ammonia synthesis towers, and other chemical equipment.

GB 6479 pipes undergo stringent testing, including hydraulic (up to 20 MPa), tensile, flattening, expanding, Charpy V-notch impact, ultrasonic, eddy current, or magnetic flux leakage tests, to ensure compliance with GB/T 6479-2013 standards. Surface treatments like shot blasting, varnishing, or coating enhance corrosion resistance, ensuring durability in corrosive fertilizer production environments. The seamless construction eliminates weld-related weaknesses, providing superior strength and reliability.

Compared to international standards like ASTM A335 or EN 10216-2, GB/T 6479 pipes are optimized for chemical fertilizer applications, with 20# aligning closely with ASTM A106B for similar uses. These pipes offer a cost-effective, high-performance solution for high-pressure systems, addressing challenges like chemical corrosion and high-pressure stress. They are widely used in China and exported globally, particularly to regions like India, Vietnam, and the Middle East, due to their quality and compliance with rigorous standards.

GB 6479 seamless steel pipes are the preferred choice for engineers and manufacturers in fertilizer production, petrochemical plants, and other chemical industries, ensuring safe and efficient fluid transport under extreme conditions.

Key Benefits

High-Pressure Resistance

Designed to withstand pressures from 10 to 30 MPa.

Cost-Effective

High-quality seamless design reduces maintenance costs.

Versatile Applications

Ideal for fertilizer and chemical equipment pipelines.

Corrosion Resistance

Coatings enhance durability in corrosive environments.

Rigorous Testing

Hydraulic, ultrasonic, and impact tests ensure quality.

Wide Temperature Range

Operates reliably from -40°C to 400°C.

GB 6479 High-Pressure Chemical Fertilizer Seamless Tubes

Standard Overview

GB 6479 (officially GB 6479—2013 Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipment) is the national standard of the People’s Republic of China governing the production, inspection, and application of seamless steel tubes used in high-pressure fertilizer equipment. Published on 18 September 2013 and implemented on 1 July 2014 by the General Administration of Quality Supervision, Inspection and Quarantine of the PRC and the Standardization Administration of China, this standard ensures safety and reliability of seamless tubes in demanding chemical-industry environments.

Scope of Application

Seamless steel tubes for high-pressure fertilizer equipment and pipelines.
Seamless steel tubes for other chemical equipment.

Main Content

The standard specifies dimensions, shape, weight, technical requirements, testing methods, inspection rules, packaging, marking, and quality certificates for high-pressure fertilizer seamless tubes. Clear technical guidance guarantees product quality and consistency.

Technical Requirements

Chemical composition – to ensure corrosion and oxidation resistance.
Mechanical properties – strength, toughness, and fatigue resistance.
Process performance – suitability for forming and welding.
Surface quality – free of defects that could compromise integrity.

Size & Tolerances

Strict dimensional controls (outer diameter and wall thickness) guarantee pressure-bearing capacity and interchangeability.

Inspection & Acceptance

Chemical composition analysis
Mechanical property testing
Non-destructive testing (UT, ET, MT)
Visual and dimensional inspection

Technical Specifications

Chemical Composition of GB 6479 Seamless Steel Pipes
Grade	C (%)	Si (%)	Mn (%)	Cr (%)	Mo (%)	V (%)	W (%)	Nb (%)	Ni (%)	P (≤%)	S (≤%)
10	0.07-0.13	0.17-0.37	0.35-0.65	-	-	-	-	-	-	0.025	0.015
20	0.17-0.23	0.17-0.37	0.35-0.65	-	-	-	-	-	-	0.025	0.015
Q345B	0.12-0.20	0.20-0.50	1.20-1.70	<0.30	<0.10	Mis	-	<0.07	<0.50	0.025	0.015
Q345C	0.12-0.20	0.20-0.50	1.20-1.70	<0.30	<0.10	<0.15	-	<0.07	<0.50	0.025	0.015
Q345D	0.12-0.18	0.20-0.50	1.20-1.70	<0.30	<0.10	<0.15	-	<0.07	<0.50	0.025	0.015
Q345E	0.12-0.18	0.20-0.50	1.20-1.70	<0.30	<0.10	<0.15	-	<0.07	<0.50	0.025	0.010
12CrMo	0.08-0.15	0.17-0.37	0.40-0.70	0.40-0.70	0.40-0.55	-	-	-	-	0.025	0.015
15CrMo	0.12-0.18	0.17-0.37	0.40-0.70	0.80-1.10	0.40-0.55	-	-	-	-	0.025	0.015
12Cr2Mo	0.08-0.15	<0.50	0.40-0.60	2.00-2.50	0.90-1.13	-	-	-	-	0.025	0.015
12Cr5Mo	<0.15	<0.50	<0.60	4.00-6.00	0.40-0.60	-	-	-	<0.60	0.025	0.015
10MoWVNb	0.07-0.13	0.50-0.80	0.50-0.80	-	0.60-0.90	0.30-0.50	0.50-0.90	0.06-0.12	-	0.025	0.015
12SiMoVNb	0.08-0.14	0.50-0.80	0.60-0.90	-	0.90-1.10	0.30-0.50	-	0.04-0.08	-	0.025	0.015

Awhen It Is Necessary To Add Fine Grain Elements, The Steel Shall Contain At Least One Of Al, Nb, V And Ti. The Added Fine Grain Elements Shall Be Indicated In The Quality Certificate. Ti Content Shall Not Be More Than 0.20%. BAl Content In Steel Shall Not Be Less Than 0.020%, Or Ala Content In Steel Shall Not Be Less Than 0.015%

Mechanical Properties of GB 6479 Seamless Steel Pipes
Grade	Tensile Strength (MPa)	Yield Strength (MPa) Not Less Than			Elongation After Fracture (%) Not Less Than		Reduction Of Area (Z/%)	Test Temperature (℃)	Impact Energy (KV2, J) Not Less Than
		Steel Tube Wall Thickness (mm)			Portrait	Transverse			Portrait	Transverse
		≤16	>16 — 40	>40	Portrait	Transverse			Portrait	Transverse
10	335-490	205	195	185	24	22	—	—	—	—
20	410-550	245	235	225	24	22	—	0	40	27
Q345B	490-670	345	335	325	21	19	—	20	40	27
Q345C	490-670	345	335	325	21	19	—	0	40	27
Q345D	490-670	345	335	325	21	19	—	-20	40	27
Q345E	490-670	345	335	325	21	19	—	-40	40	27
12CrMo	410-560	205	195	185	21	19	—	20	40	27
15CrMo	440-640	295	285	275	21	19	—	20	40	27
12Cr2Mo	450-600	280	—	—	20	18	—	20	40	27
12Cr5Mo	390-590	195	185	175	22	20	—	20	40	27
10MoWVNb	470-670	295	285	275	19	17	—	20	40	27
12SiMoVNb	470-670	315	305	295	19	17	50	20	40	27

Comparison of GB/T 6479 20# with Other Standards
Feature	GB/T 6479 20#	ASTM A106B	EN 10216-2 P265GH
Material Type	Carbon Steel (Seamless)	Carbon Steel (Seamless)	Carbon Steel (Seamless)
Temperature Range	-40°C to 400°C	Up to 400°C	Up to 450°C
Pressure Range	10–30 MPa	Moderate pressure	Moderate pressure
Corrosion Resistance	Good (With coatings)	Good (With coatings)	Good
Applications	Fertilizer equipment, chemical pipelines	General high-temperature service	Pressure systems, boilers
Tensile Strength (MPa)	410–550	≥415	410–570
Yield Strength (MPa)	245	≥240	265
Key Advantage	High-pressure fertilizer applications	General-purpose high-temperature use	Precision for pressure systems

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A curated list of long-tail keywords for GB 6479 seamless steel pipes, covering specifications, applications, and material properties, presented in a multi-column layout.

Standards and Specifications

• GB/T 6479-2013 seamless steel pipe specifications
• GB 6479 high-pressure fertilizer pipe standards
• GB/T 6479 carbon steel pipe properties
• Chinese standard seamless fertilizer pipe tolerances

Applications

• GB 6479 pipes for high-pressure fertilizer equipment
• GB/T 6479 seamless pipes for chemical pipelines
• GB 6479 tubes for urea reactors
• Chinese standard pipes for ammonia synthesis

Material and Grades

• GB/T 6479 20# carbon steel material
• GB 6479 pipe grades
• GB seamless fertilizer pipe corrosion resistance

Manufacturing and Testing

• GB/T 6479 seamless pipe manufacturing process
• GB 6479 pipes hydraulic testing
• GB seamless pipe quality control

Procurement and Suppliers

• GB 6479 seamless steel pipes suppliers
• GB/T 6479 seamless pipe distributors
• Chinese standard fertilizer pipes price

Dimensions and Customization

• GB/T 6479 seamless pipe dimensions
• GB 6479 pipe tolerances
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Note: GB/T 6479-2013 covers seamless steel tubes for high-pressure chemical fertilizer equipment. For detailed specifications, refer to the GB/T 6479-2013 standard or contact a certified supplier.

GB 6479 seamless steel pipes, under GB/T 6479-2013, are high-quality carbon and alloy steel tubes designed for high-pressure chemical fertilizer equipment and pipelines, operating at temperatures from -40°C to 400°C and pressures from 10 to 30 MPa.

Common grades include 10#, 20#, Q345B/C/D/E, 12CrMo, 15CrMo, 12Cr2Mo, 12Cr5Mo, and 10MoWVNb, with 20# widely used for its toughness and weldability in fertilizer equipment.

For 20#:
- C: 0.17–0.24%; Si: 0.17–0.37%; Mn: 0.35–0.65%; P: ≤0.030%; S: ≤0.030%

For 20#:
- Yield Strength: ≥245 MPa
- Tensile Strength: 410–550 MPa
- Elongation: ≥20%
- Impact Test (0°C): ≥27 J (for OD ≥76 mm, WT ≥14 mm)

Outer diameters: 16–168 mm; wall thicknesses: 2.0–30 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 shot blasting or coating.

Includes hydraulic (up to 20 MPa), tensile, flattening, expanding, Charpy V-notch impact, ultrasonic, eddy current, or magnetic flux leakage tests to ensure quality.

Used in high-pressure fertilizer equipment, chemical pipelines, urea reactors, ammonia synthesis towers, petrochemical plants, and power plant steam systems.

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
- Q345E ≈ EN 10216-2 P265GH

20G seamless pipe, equivalent to 20# under GB/T 6479-2013, is a high-quality carbon structural steel used for high-pressure fertilizer equipment and pipelines, known for its toughness, weldability, and suitability for temperatures from -40°C to 400°C.

For 20G (20#):
- Chemical Composition: C 0.17–0.24%; Si 0.17–0.37%; Mn 0.35–0.65%; P ≤0.030%; S ≤0.030%
- Mechanical Properties: Yield Strength ≥245 MPa; Tensile Strength 410–550 MPa; Elongation ≥20%; Impact Test (0°C) ≥27 J (for OD ≥76 mm, WT ≥14 mm)

20G seamless pipes (20#) are used in high-pressure fertilizer equipment, such as urea reactors and ammonia synthesis towers, and in chemical pipelines for their strength and corrosion resistance.

20G (20#) is a carbon steel with good weldability and toughness, suitable for temperatures up to 400°C. Q345E, a low-alloy steel, offers higher strength (yield strength ≥345 MPa) and better low-temperature impact resistance, ideal for colder conditions.

20G 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 shot blasting or coating for corrosion resistance.

GB 6479 Seamless Steel Pipes

GB 6479 Seamless Steel Pipes