GB 3087 steel pipes, compliant with the Chinese national standard GB/T 3087-2008, are seamless carbon steel pipes designed for low and medium-pressure boilers. These pipes are used in applications such as heating pipelines, steam pipelines, and locomotive boilers, offering high strength, good plasticity, and reliable performance under moderate pressures and temperatures.

Manufactured through hot-rolling (extrusion, expansion) or cold-drawing (rolling) processes, GB/T 3087 seamless pipes are available in outer diameters from 10 mm to 426 mm and wall thicknesses from 2 mm to 40 mm, as per GB/T 17395. Common steel grades include 10# and 20#, with 20# being widely used for its excellent mechanical properties and weldability. These pipes are suitable for boiler systems with working pressures ≤5.9 MPa and maximum wall temperatures of ≤480°C for heating surface pipes or ≤430°C for headers and steam pipes.

GB 3087 steel pipes undergo stringent testing, including tensile, flattening, flaring, bending, hydrostatic, and optional ultrasonic tests, to ensure compliance with GB/T 3087-2008 standards. Surface treatments such as galvanizing or black painting enhance corrosion resistance, making them suitable for harsh boiler environments. The seamless construction ensures uniform strength and leak-proof performance, critical for boiler applications.

Compared to international standards like ASTM A192 or EN 10216-1, GB/T 3087 pipes are optimized for Chinese boiler manufacturing requirements, with grade 20# closely aligning with ASTM A192 for similar applications. These pipes offer a cost-effective solution for low and medium-pressure boiler systems, addressing challenges like thermal stress and corrosion. They are widely used in China and exported globally, particularly in Asia, due to their reliability and adherence to rigorous standards.

GB 3087 steel pipes are a trusted choice for engineers and manufacturers in power generation, industrial boiler systems, and locomotive boiler applications, ensuring safety and efficiency in fluid and steam transport.

Technical Specifications

Chemical Composition of GB 3087 Steel Pipes
Standard	Steel Grade	C (%)	Si (%)	Mn (%)	S (%)	P (%)	Cr (%)
GB 3087	10	0.07-0.13	0.17-0.37	0.35-0.65	0.020	0.025	≤0.15
GB 3087	20	0.17-0.23	0.17-0.37	0.35-0.65	0.020	0.025	≤0.25

Mechanical Properties of GB 3087 Steel Pipes
Standard	Steel Pipe Grade	Wall Thickness (mm)	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
Standard	Steel Pipe Grade	Wall Thickness (mm)	Tensile Strength (MPa)	≥
GB 3087	10	/	335-475	195	24
	20	＜15	410-550	245	20
	20	≥15	410-550	225	20

High-Temperature Performance Parameters of Steel Grades
Steel Grade	Sample Status	Temperature (℃)
Steel Grade	Sample Status	200	250	300	350	400	450
10	Delivery Status	165	145	122	111	109	107
20	Delivery Status	188	170	149	137	134	132

Designations and Descriptions of Tube Processing States
Processing Designation	Symbol	Description
Cold-finished/hard (cold-finished as-drawn)	BK	No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)	BKW	After the last heat treatment there is a light finishing pass (cold drawing). With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed	GBK	After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized	NBK	The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

Note:

Yield point requirements for seamless precision steel tubes vary significantly based on their delivery conditions, directly influencing their mechanical performance in industrial applications. These differences are critical for engineers selecting materials for specific load-bearing or forming needs.

For tubes delivered in the annealed (GBK) condition, the yield point is specified to be at least 50% of the ultimate tensile strength. This lower yield ratio ensures excellent ductility and formability, making GBK tubes suitable for applications requiring bending, flanging, or other cold-working processes where flexibility is paramount.

In contrast, tubes delivered in cold-finished/hard (BK) condition exhibit a significantly higher yield point due to work hardening from the drawing process. It is recommended that their yield point be ≥ 80% of the tensile strength. This high yield ratio provides enhanced rigidity and load-bearing capacity, ideal for structural components where dimensional stability under stress is critical.

Cold-finished/soft (BKW) condition represents a middle ground, with a recommended yield point of ≥ 70% of the tensile strength. This balance of strength and ductility makes BKW tubes versatile for applications that require both moderate formability and resistance to deformation, such as precision machinery parts or hydraulic system components.

These yield point specifications—tied directly to the degree of deformation during manufacturing—ensure that engineers can select the optimal delivery condition based on their application’s mechanical demands, whether prioritizing formability (GBK), maximum strength (BK), or a balanced performance (BKW).

Steel Pipe Outer Diameter Expansion Rate (GB 3087 Standard)
Standard	Steel Grade	Steel Pipe Outer Diameter Expansion Rate (%)
		Inside Diameter / Outer Diameter
		≤0.6	＞0.6 - 0.8	＞0.8
GB 3087	10	12	15	19
GB 3087	20	10	12	17

Comparison of GB/T 3087 20# with Other Standards
Feature	GB/T 3087 20#	ASTM A192	EN 10216-1 P235TR1
Material Type	Carbon Steel (Seamless)	Carbon Steel (Seamless)	Carbon Steel (Seamless)
Temperature Range	≤480°C (heating surface)	High temperatures	Ambient to moderate
Precision	Moderate	High	High
Corrosion Resistance	Good (With coatings)	Good (With coatings)	Good (With coatings)
Applications	Low/medium-pressure boilers	High-pressure boilers	Fluid transport, pressure systems
Tensile Strength (MPa)	410–550	≥325	360–500
Yield Strength (MPa)	235	≥180	235
Key Advantage	Cost-effective for boilers	High-pressure performance	Precision for pressure systems

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A curated list of long-tail keywords for GB 3087 steel pipes, covering specifications, applications, and material properties, presented in a multi-column layout.

Standards and Specifications

• GB/T 3087-2008 seamless steel pipe specifications
• GB 3087 boiler pipe standards
• GB/T 3087 carbon steel pipe properties
• Chinese standard seamless boiler pipe tolerances

Applications

• GB 3087 pipes for low-pressure boilers
• GB/T 3087 seamless pipes for steam pipelines
• GB 3087 pipes for locomotive boilers
• Chinese standard pipes for heating systems

Material and Grades

• GB/T 3087 20# carbon steel material
• GB 3087 pipe grades
• GB seamless boiler pipe corrosion resistance

Manufacturing and Testing

• GB/T 3087 seamless pipe manufacturing process
• GB 3087 pipes hydrostatic testing
• GB seamless pipe quality control

Procurement and Suppliers

• GB 3087 steel pipes suppliers
• GB/T 3087 seamless pipe distributors
• Chinese standard boiler pipes price

Dimensions and Customization

• GB/T 3087 seamless pipe dimensions
• GB 3087 pipe tolerances
• GB seamless pipes custom lengths

Note: GB/T 3087-2008 covers seamless steel pipes for low and medium-pressure boilers. For detailed specifications, refer to the GB/T 3087-2008 standard or contact a certified supplier.

GB 3087 steel pipes, under GB/T 3087-2008, are seamless carbon steel pipes designed for low and medium-pressure boilers, suitable for heating pipelines, steam pipelines, and locomotive boilers.

Common grades include 10# and 20#, with 20# widely used for its strength, plasticity, and weldability in boiler applications.

For 20#:
- C: 0.17–0.23%; Si: 0.17–0.37%; Mn: 0.35–0.65%; P: ≤0.035%; S: ≤0.035%

For 20#:
- Yield Strength: ≥235 MPa
- Tensile Strength: 410–550 MPa
- Elongation: ≥24%

Outer diameters: 10–426 mm; wall thicknesses: 2–40 mm; lengths: 4–12 m or custom. Tolerances: OD ±1%, wall thickness ±12.5% for hot-rolled, ±10% for cold-drawn.

Produced via hot-rolling (extrusion, expansion) or cold-drawing (rolling); delivered in hot-rolled or heat-treated condition, with optional galvanizing or black painting.

Includes tensile, flattening, flaring, bending, hydrostatic, and optional ultrasonic testing to ensure quality and compliance.

Used in low and medium-pressure boilers, locomotive boilers, steam pipelines, and heat exchangers in industrial and power generation 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 A192
- 20# ≈ EN 10216-1 P235TR1
- 10# ≈ ASTM A179

20G seamless pipe, specified under GB/T 5310 for high-pressure boilers, is equivalent to 20# under GB/T 3087 for low and medium-pressure boilers. It is a low-carbon steel grade known for its strength, plasticity, and weldability, ideal for boiler heating surfaces and steam pipelines.

For 20G (20# under GB/T 3087):
- Chemical Composition: C 0.17–0.23%; Si 0.17–0.37%; Mn 0.35–0.65%; P ≤0.035%; S ≤0.035%
- Mechanical Properties: Yield Strength ≥235 MPa; Tensile Strength 410–550 MPa; Elongation ≥24%

20G seamless pipes (20#) are used in low and medium-pressure boiler systems, including heating pipelines, steam pipelines, and locomotive boiler components, due to their excellent weldability and thermal stability.

20G (20#) has higher carbon content (0.17–0.23% vs. 0.07–0.13%) and yield strength (≥235 MPa vs. ≥195 MPa) than 10#, making it suitable for higher-pressure boiler applications, while 10# is preferred for lower-stress components.

20G seamless pipes are manufactured via hot-rolling (extrusion, expansion) or cold-drawing (rolling), delivered in hot-rolled or heat-treated conditions, with optional treatments like galvanizing or black painting to enhance corrosion resistance.

Industrial Applications

GB/T 3087 seamless steel pipes are essential for low and medium-pressure boiler systems requiring high strength and thermal stability.

Industrial Boilers

Used for heating and steam pipelines in industrial boiler systems.

Locomotive Boilers

Applied in superheating steam and flue tubes for locomotives.

Power Generation

Used in steam and fluid transport in power plants.

Heat Exchangers

Utilized in low and medium-pressure heat exchanger systems.

Chemical Industry

Supports fluid transport in chemical processing plants.

General Boiler Systems

Used in various low and medium-pressure boiler applications.

GB 3087 Steel Pipes

GB/T 3087 Grade 20

GB 3087 Grade 10 Seamless Pipe