Seamless Steel Tubes for High-Pressure and High-Temperature Boilers

GB 5310 high-pressure boiler tubes, compliant with the Chinese national standard GB/T 5310-2017, are seamless steel tubes designed for high-pressure and high-temperature boiler applications. These tubes are used in critical components such as superheaters, reheaters, steam pipelines, and economizers in power plants and industrial boiler systems, offering exceptional strength, corrosion resistance, and thermal stability.

Manufactured through hot-rolling (extrusion, expansion) or cold-drawing (rolling) processes, GB/T 5310 seamless tubes are available in outer diameters from 23 mm to 1500 mm and wall thicknesses from 2.8 mm to 150 mm, as per GB/T 5310-2017. Common steel grades include 20G, 15MoG, 12Cr1MoVG, and 10Cr9Mo1VNbN, with 20G being the most widely used due to its excellent mechanical properties and weldability. These tubes are designed for working pressures above 9.8 MPa and temperatures between 450°C and 650°C, with 20G tubes suitable for long-term use at wall temperatures ≤450°C for heating surfaces and ≤425°C for headers and steam pipes.

GB 5310 boiler tubes undergo rigorous testing, including hydraulic, ultrasonic, tensile, impact, and flattening tests, to ensure compliance with GB/T 5310-2017 standards. Surface treatments such as varnishing, shot blasting, or coating enhance corrosion resistance, making them ideal for harsh high-pressure boiler environments. The seamless design ensures uniform strength, eliminating weak points and ensuring leak-proof performance critical for boiler safety.

Compared to international standards like ASTM A335, EN 10216-2, or DIN 17175, GB/T 5310 tubes are optimized for high-pressure boiler applications, with 20G closely aligning with ASTM A106B and ST45.8 for similar uses. These tubes offer a reliable and cost-effective solution for power generation and petrochemical industries, addressing challenges like high-temperature creep and oxidation. They are widely used in China and globally, particularly in Asia, due to their durability and adherence to strict standards.

GB 5310 high-pressure boiler tubes are essential for engineers and manufacturers in power plants, petrochemical facilities, and industrial boiler systems, ensuring efficient steam generation and safe fluid transport under extreme conditions.

Heat Treatment of 15CrMo Alloy Round Steel

Heat treatment is a highly effective means of improving and modifying the properties of 15CrMo alloy round steel. It plays a very important role in product reliability and economy. Heat treatment of 15CrMo alloy round steel usually includes ordinary heat treatment (annealing, normalising, quenching, tempering) and surface heat treatment (surface quenching and chemical heat treatment - carburising, nitriding, metallising, etc.).

In mechanical engineering, many machine parts, such as crankshafts, gears, camshafts of internal combustion engines and gears in important reduction gears, require not only sufficient toughness, plasticity and bending strength in the core, but also a high surface thickness within a certain thickness. hardness, high wear resistance and high fatigue strength. It is difficult to meet the above performance requirements simultaneously with the above various overall heat treatment methods, and the use of surface heat treatment is the most effective method to meet these performance requirements simultaneously.

Surface heat treatment is a heat treatment method that changes the surface properties of 15CrMo alloy round steel by changing the structure of the surface layer.

Surface quenching is a heat treatment that gradually changes the surface structure without changing the chemical composition of the surface. It can be carried out by high-frequency, medium-frequency or power-frequency induction heating method or flame heating method. The common feature is that the surface of 15CrMo alloy round steel is quickly heated to the quenching temperature, and when the heat is not transferred to the core of the part, it is quickly cooled, so that the surface hardness is high, but the core still has high toughness.

Chemical heat treatment is a heat treatment method that changes the chemical composition and structure of the surface layer of 15CrMo alloy round steel. Chemical heat treatment can be divided into methods such as carburizing, nitriding, carbonitriding and metallising according to the different elements infiltrated on the surface of 15CrMo alloy round steel. It is very effective in improving and enhancing the wear resistance, corrosion resistance and fatigue resistance of 15CrMo alloy round steel. At present, chemical heat treatment has developed rapidly, and there are many applications of new technologies.

Key Benefits

High-Temperature Resistance

Engineered to withstand temperatures up to 650°C for reliable boiler performance.

Cost-Effective

Durable seamless design reduces maintenance and replacement costs.

Versatile Applications

Ideal for superheaters, reheaters, and steam pipelines in power plants.

Corrosion Resistance

Enhanced by coatings to withstand harsh boiler environments.

Rigorous Testing

Hydraulic, ultrasonic, and tensile tests ensure quality and safety.

Seamless Design

Ensures uniform strength and leak-proof performance.

Technical Specifications

Chemical Composition of GB 5310 High‑Pressure Seamless Boiler Tubes
Steel Grade	C (%)	Si (%)	Mn (%)	S (%)	P (%)	Cr (%)	Mo (%)	V (%)	Ti (%)	B (%)	W (%)	Ni (%)	Al (%)	Nb (%)	N (%)
Steel Grade	C (%)	Si (%)	Mn (%)	S (%)	P (%)	Cr (%)	Mo (%)	V (%)	Ti (%)	B (%)	W (%)	Ni (%)	Al (%)	Nb (%)	N (%)	20G	0.17-0.23	0.17-0.37	0.35-0.65	0.015	0.025	—	—	—	—	—	—	—	—	—	—
20 MnG	0.17-0.24	0.17-0.37	0.70-1.00	0.015	0.025	—	—	—	—	—	—	—	—	—	—	—
25MnG	0.22-0.27	0.17-0.37	0.70-1.00	0.015	0.025	—	—	—	—	—	—	—	—	—	—
15MoG	0.12-0.20	0.17-0.37	0.40-0.80	0.015	0.025	—	0.25-0.35	—	—	—	—	—	—	—	—
20MnG	0.15-0.25	0.17-0.37	0.40-0.80	0.015	0.025	—	0.44-0.65	—	—	—	—	—	—	—	—
12CrMoG	0.08-0.15	0.17-0.37	0.40-0.70	0.015	0.025	0.40-0.70	0.40-0.55	—	—	—	—	—	—	—	—
15CrMoG	0.12-0.18	0.17-0.37	0.40-0.70	0.015	0.025	0.80-1.10	0.40-0.55	—	—	—	—	—	—	—	—
12Cr2MoG	0.08-0.15	≤0.60	0.40-0.60	0.015	0.025	2.00-2.50	0.90-1.13	—	—	—	—	—	—	—	—
12Cr1MoVG	0.08-0.15	0.17-0.37	0.40-0.70	0.010	0.025	0.90-1.20	0.25-0.35	0.15-0.30	—	—	—	—	—	—	—
12Cr2MoWVTiB	0.08-0.15	0.45-0.75	0.45-0.65	0.015	0.025	1.60-2.10	0.50-0.65	0.28-0.42	0.08-0.18	0.002-0.008	0.30-0.55	—	—	—	—
10Cr9Mo1VNbN	0.08-0.12	0.20-0.50	0.30-0.60	0.010	0.020	8.00-9.50	0.85-1.05	0.18-0.25	—	—	—	≤0.040	≤0.040	0.06-0.10	0.03-0.07

Mechanical Properties of GB 5310 High‑Pressure Seamless Boiler Tubes
Grade	Tensile strength (Mpa)	Yield point(Mpa) not less than	Elongation(%) not less than	Impact(J) not less than
20G	410-550	245	24/22	40/27
25MnG	485-640	275	20/18	40/27
15MoG	450-600	270	22/20	40/27
20MnG	415-665	220	22/20	40/27
12CrMoG	410-560	205	21/19	40/27
12Cr2MoG	450-600	280	22/20	40/27
12Cr1MoVG	470-640	255	21/19	40/27
12Cr2MoWVTiB	540-735	345	18	40/27
10Cr9Mo1VNb	≥585	415	20	40
1Cr18Ni9	≥520	206	35	—
1Cr19Ni11Nb	≥520	206	35	—

Heat treatment system for steel pipes
No.	Steel Pipe	Heat Treatment
1	12G^a、20G^a	880 ℃～940 ℃, Normalizing
2	20MnG^a、25MnG^a	880 ℃～940 ℃, Normalizing
3	15MoG^a、20MoG^a	890 ℃～950 ℃, Normalizing
4	12CrMoG^a	900 ℃～960 ℃, Normalizing; 650 ℃～730 ℃, Tempering
5	15CrMoG^a	900 ℃～960 ℃, Normalizing; 660 ℃～730 ℃, Tempering
6	12Cr2MoG^a	900 ℃～960 ℃, Normalizing; 700 ℃～750 ℃, Tempering It can also be heated to 900 °C ~ 960 °C, and the furnace is cooled to 700 °C for more than 1 h, and air-cooled.
7	12Cr1MoVG^a	980 ℃～1 020 ℃, Normalizing, 980 °C ~ 1 020 °C normalizing, when the wall thickness is greater than 30 mm, forced cooling; 720 °C ~ 760 °C tempering.
8	12Cr2MoWVTiB	1 000 ℃～1 035 ℃, Normalizing; 760 ℃～790 ℃, Tempering
9	07Cr2MoW2VNbB	≥1 040 ℃, Normalizing, ≥730 ℃, Tempering
10	08Cr2Mo1W2VTiB	≥980 ℃, Normalizing, ≥730 ℃, Tempering
11	12Cr3MoVSiTiB	1 040 ℃～1 060 ℃, Normalizing; 720 ℃～770 ℃, Tempering
12	09Ni1MnMoNbCu	880 ℃～980 ℃, Normalizing, 580 ℃～680 ℃, Tempering
13	10Cr9Mo1VNbN	≥1 040 ℃, Normalizing, ≥730 ℃, Tempering
14	10Cr9MoW2VNbBN	≥1 040 ℃, Normalizing, ≥730 ℃, Tempering
15	10Cr11MoW2VNbCu1BN	≥1 040 ℃, Normalizing, ≥730 ℃, Tempering
16	11Cr9Mo1W1VNbBN	1 040 ℃～1 080 ℃, Normalizing, 740 ℃～780 ℃, Tempering
17	15Cr18Ni9^b	Solution treatment: solution temperature ≥1 040 °C.
18	10Cr18Ni9NbCu3BN^b	Solution treatment: solution temperature ≥ 1 100 °C.
19	07Cr25Ni21NbN^cd	Separate solution treatment: solution temperature ≥ 1 100 °C.
20	08Cr18Ni11Nb^bd	Solution treatment: solution temperature ≥1 040 °C.
21	07Cr18Ni11Nb^cd	Separate solution treatment: hot rolling (extrusion, expansion) steel tube solid solution temperature ≥ 1 050 °C, cold drawn (rolled) steel tube solid solution temperature ≥ 1100 °C.
22	08Cr18Ni10NbFG	Softening heat treatment before cold working: softening heat treatment temperature should be at least 50 °C higher than solution heat treatment temperature; solution treatment after final cold working: solution temperature ≥1 180 °C
a. The finishing temperature of the hot-rolled steel pipe is at the critical temperature of the phase transition Ar3 to the upper limit of the temperature specified in the table, and when the steel pipe is air-cooled, the steel pipe is considered to be normalized. b. The finishing temperature of the hot-rolled steel pipe meets the solid solution temperature specified in the table. As an alternative to the solid solution treatment method, the steel pipe can be separately quenched by water or cooled by other fast enough methods. c. The solution treatment should be a separate heat treatment, and the heat treatment in the process is not allowed to replace the separate solution treatment. d. According to the requirements of the purchaser, the steel pipes of the grades 07Cr25Ni21NbN, 08Cr19Ni10Nb and 07Cr18Ni11Nb may be subjected to a stabilization heat treatment lower than the initial solution treatment temperature after the solution treatment, and the temperature of the stabilization heat treatment is negotiated between the supplier and the purchaser.

Steel Material equivalent of SCM415
Country	Standard	Material
USA	SAE/AISI/UNS	-
Germany	DIN,WNr	15CrMO \| 1.7262
China	GB	15CrMo
Japan	JIS	SCM415
France	AFNOR	15CD4.05
England	BS	1501-620 \| Cr31
Italy	UNI	-
Poland	PN	-
Czechia	CSN	-
Austria	ONORM	-
Sweden	SS	-
Spain	UNE	-

Comparison of GB/T 5310 20G with Other Standards
Feature	GB/T 5310 20G	ASTM A335 P11	EN 10216-2 P265GH
Material Type	Carbon Steel (Seamless)	Alloy Steel (Seamless)	Carbon Steel (Seamless)
Temperature Range	≤450°C (heating surface)	Up to 600°C	Up to 450°C
Precision	High	High	High
Corrosion Resistance	Good (With coatings)	Excellent	Good
Applications	High-pressure boilers	High-temperature boilers	Pressure systems
Tensile Strength (MPa)	410–550	≥415	410–570
Yield Strength (MPa)	230–250	≥205	265
Key Advantage	Cost-effective for high-pressure boilers	Superior high-temperature strength	Precision for pressure systems

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

You Can Also Search GB 5310 High-Pressure Boiler Tubes by

A curated list of long-tail keywords for GB 5310 high-pressure boiler tubes, covering specifications, applications, and material properties, presented in a multi-column layout.

Standards and Specifications

• GB/T 5310-2017 seamless boiler tube specifications
• GB 5310 high-pressure boiler pipe standards
• GB/T 5310 carbon steel tube properties
• Chinese standard seamless boiler tube tolerances

Applications

• GB 5310 tubes for high-pressure boilers
• GB/T 5310 seamless tubes for superheaters
• GB 5310 pipes for steam pipelines
• Chinese standard tubes for power plants

Material and Grades

• GB/T 5310 20G carbon steel material
• GB 5310 boiler tube grades
• GB seamless boiler tube corrosion resistance

Manufacturing and Testing

• GB/T 5310 seamless tube manufacturing process
• GB 5310 tubes hydraulic testing
• GB seamless tube quality control

Procurement and Suppliers

• GB 5310 high-pressure boiler tubes suppliers
• GB/T 5310 seamless tube distributors
• Chinese standard boiler tubes price

Dimensions and Customization

• GB/T 5310 seamless tube dimensions
• GB 5310 tube tolerances
• GB seamless tubes custom lengths

Note: GB/T 5310-2017 covers seamless steel tubes for high-pressure boilers. For detailed specifications, refer to the GB/T 5310-2017 standard or contact a certified supplier.

GB 5310 high-pressure boiler tubes, under GB/T 5310-2017, are seamless steel tubes designed for high-pressure and high-temperature boiler applications, such as superheaters, reheaters, and steam pipelines in power plants.[](https://www.sunnysteel.com/gb5310.php)

Common grades include 20G, 15MoG, 12Cr1MoVG, and 10Cr9Mo1VNbN, with 20G widely used for its excellent mechanical properties and weldability in high-pressure boilers.[](https://www.svsteelpipe.com/standard/gb-t5310.html)

For 20G:
- C: 0.17–0.24%; Si: 0.17–0.37%; Mn: 0.38–0.65%; P: ≤0.030%; S: ≤0.030%[](https://north-steels.com/product/gb-5310-20g-high-pressure-seamless-boiler-tubes/)

For 20G:
- Yield Strength: ≥230–250 MPa
- Tensile Strength: 410–550 MPa
- Elongation: ≥22%[](https://north-steels.com/product/gb-5310-20g-high-pressure-seamless-boiler-tubes/)

Outer diameters: 23–1500 mm; wall thicknesses: 2.8–150 mm; lengths: 6 m or custom. Tolerances: OD ±1%, wall thickness ±10% for cold-drawn, ±12.5% for hot-rolled.[](https://north-steels.com/product/gb-5310-20g-high-pressure-seamless-boiler-tubes/)

Produced via hot-rolling (extrusion, expansion) or cold-drawing (rolling); delivered in heat-treated condition, with optional varnishing or coating to prevent rust.[](https://north-steels.com/product/gb-5310-20g-high-pressure-seamless-boiler-tubes/)

Includes hydraulic, ultrasonic, tensile, impact, and flattening tests to ensure quality and compliance with GB/T 5310-2017 standards.[](https://www.svsteelpipe.com/standard/gb-t5310.html)

Used in high-pressure boilers for superheaters, reheaters, steam pipelines, and economizers in power plants and petrochemical industries.[](https://www.sunnysteel.com/gb-5310-high-pressure-boiler-tube.php)

Marked with standard, grade, OD×WT, heat number, and manufacturer ID. Orders specify standard, grade, dimensions, length, and test certificates.[](https://www.btboilertube.com/Boiler_Tube/GB_5310_High_Pressure_Boiler_Tubes/GB_5310_20MnG_High_Pressure_Boiler_Tubes.html)

Common equivalents include:
- 20G ≈ ASTM A106B, ST45.8
- 12Cr1MoVG ≈ ASTM A335 P11
- 15MoG ≈ ASTM A335 P1[](https://north-steels.com/product/gb-5310-20g-high-pressure-seamless-boiler-tubes/)[](https://www.sunnysteel.com/gb-5310-12cr1movg-high-pressure-seamless-boiler-tubes.php)

20G seamless pipe is a high-quality carbon structural steel specified under GB/T 5310-2017 for high-pressure boilers. It is known for its strength, plasticity, and weldability, ideal for superheaters, reheaters, and steam pipelines.[](https://www.btboilertube.com/Boiler_Tube/GB_5310_High_Pressure_Boiler_Tubes/GB_5310_20G_Seamless_Boiler_Tubes.html)

For 20G:
- Chemical Composition: C 0.17–0.24%; Si 0.17–0.37%; Mn 0.38–0.65%; P ≤0.030%; S ≤0.030%
- Mechanical Properties: Yield Strength ≥230–250 MPa; Tensile Strength 410–550 MPa; Elongation ≥22%[](https://north-steels.com/product/gb-5310-20g-high-pressure-seamless-boiler-tubes/)

20G seamless pipes are used in high-pressure boiler systems, including superheaters, reheaters, steam pipelines, and economizers, due to their excellent heat transfer and high-temperature strength.[](https://www.sunnysteel.com/gb-5310-high-pressure-boiler-tube.php)

20G is a carbon steel with good weldability and moderate strength, suitable for temperatures ≤450°C. 15MoG, a low-alloy steel with molybdenum, offers higher temperature resistance (up to 650°C) and better thermal fatigue resistance.[](https://www.sunnysteel.com/gb-5310-15mog-high-pressure-seamless-boiler-tubes.php)

20G seamless pipes are manufactured via hot-rolling (extrusion, expansion) or cold-drawing (rolling), delivered in heat-treated condition (e.g., normalizing at 910°C ±10°C for wall thickness >14 mm), with optional coatings for corrosion resistance.[](https://north-steels.com/product/gb-5310-20g-high-pressure-seamless-boiler-tubes/)

GB 5310 High‑Pressure Seamless Boiler Tubes

15CrMoG alloy pipe

12Cr1MoVG Seamless Pipe

GB 5310 20MnG

GB 5310 25MnG

GB 5310 12Cr2MoG

GB/T 5310 10Cr9Mo1VNbN

GB 5310 12Cr2MoWVTiB Seamless Bo

Seamless Steel Tubes for High-Pressure and High-Temperature Boilers

Heat Treatment of 15CrMo Alloy Round Steel