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20G High-Pressure Boiler Tube
20G High-Pressure Boiler Tube
20G High-Pressure Boiler Tube
20G High-Pressure Boiler Tube
20G High-Pressure Boiler Tube
20G High-Pressure Boiler Tube
Specifications
Brand Name :
Hengxin Zhicheng
Model Number :
High-Pressure Boiler Tube
Certification :
ASTM, GB, ISO, etc.
Place of Origin :
CHINA
MOQ :
1 PCE
Price :
Negotiation
Payment Terms :
L/C, T/T
Delivery Time :
10 to 35 days
Packaging Details :
Default bare pipe bundling, or packaging according to customer requirements, such as oil cloth packaging, wooden box packaging, frame packaging
Description

20G High-Pressure Boiler Tube

20G high-pressure boiler tube is a high-quality carbon structural steel seamless steel tube specially used for manufacturing pressure pipelines in power plant boilers, industrial boilers, and other high-pressure equipment. It is known as the "main artery" of modern boiler equipment, undertaking the important mission of transporting high-temperature and high-pressure steam. Its performance and quality directly affect the safety, stability, and efficient operation of the entire boiler system.

The meaning and standards of 20G

20G ": Among them," 20 "indicates that the average carbon content of the steel is 0.20% (the actual range is usually 0.17%~0.23%), which belongs to low-carbon steel. G "is the first letter of the Chinese Pinyin" Gu ō L ú "for" boiler ", specifically referring to steel used in boilers.

Execution standard: The most core standard in China is GB 5310-2017 "Seamless Steel Tubes for High Pressure Boilers". This standard provides strict regulations on the chemical composition, mechanical properties, process performance, dimensional deviation, surface quality, and non-destructive testing of 20G steel pipes. In addition, it often corresponds to international standards such as ASTM A106/210.

Dimensional tolerance:
Pipe types Outer-caliber(D) Thickness(S)
Pipe outer-caliber(mm) Allowable warp(mm) Pipe thickness(mm) Allowable warp(mm)
Hot-rolled pipes ＞219～457 ±1.0％ ≤20 －10％,＋12.5％
＞20～40 －10％,＋10％
＞457～1066 ±0.9％ ＞40～70 －7％,＋9％
＞70～120 －6％,＋8％
Mechanical Properties:
Standards Steel pipes No. Tensile strength(MPa) Bend strength(MPa) Elongation(％) Impact energy(J) Hardness
GB3087 10 335～475 ≥195 ≥24 /
20 410～550 ≥245 ≥20 /
GB5310 20G 410～550 ≥245 ≥24 ≥35 /
20MnG ≥415 ≥240 ≥22 ≥35 /
25MnG ≥485 ≥275 ≥20 ≥35 /
15CrMoG 440～640 ≥235 ≥21 ≥35 /
12Cr2MoG 450～600 ≥280 ≥20 ≥35 /
12Cr1MoVG 470～640 ≥255 ≥21 ≥35 /
10Cr9Mo1VNb ≥585 ≥415 ≥20 ≥35 /
ASME SA106 SA106B ≥415 ≥240 ≥22 ≥35 /
SA106C ≥485 ≥275 ≥20 ≥35 /
ASME SA333 SA333Ⅰ ≥380 ≥205 ≥28 －45≥18 /
ASME SA335 SA335 P11 ≥415 ≥205 ≥22 ≥35 ≤163HB
SA335 P12 ≥415 ≥220 ≥22 ≥35 ≤163HB
SA335 P22 ≥415 ≥205 ≥22 ≥35 ≤163HB
SA335 P5 ≥415 ≥205 ≥22 ≥35 ≤187HB
SA335 P91 585～760 ≥415 ≥20 ≥35 ≤250HB
SA335 P92 ≥620 ≥440 ≥20 ≥35 250HB
DIN17175 ST45.8/Ⅲ 410～530 ≥255 ≥21 ≥27(DVM) /
15Mo3 450～600 ≥270 ≥22 ≥34(DVM) /
13CrMo44 440～590 ≥290 ≥22 ≥34(DVM) /
10CrMo910 480～630 ≥280 ≥20 ≥34(DVM) /
EN10216-2 15NiCuMoNb5-6-4 (WB36) 610～780 ≥440 ≥19 ≥40 /

Chemical composition:

Standards Steel pipes No. Chemical composition(%)
C Si Mn P S Cr Mo Cu Ni V Al W Nb N
GB3087 10 0.07～0.13 0.17～0.37 0.38～0.65 ≤0.030 ≤0.030 0.3～0.65 / ≤0.25 ≤0.30 / /
20 0.17～0.23 0.17～0.37 0.38～0.65 ≤0.030 ≤0.030 0.3～0.65 / ≤0.25 ≤0.30 / /
GB5310 20G 0.17～0.24 0.17～0.37 0.35～0.65 ≤0.030 ≤0.030 ≤0.25 ≤0.15 ≤0.20 ≤0.25 ≤0.08
20MnG 0.17～0.25 0.17～0.37 0.70～1.00 ≤0.030 ≤0.030 ≤0.25 ≤0.15 ≤0.20 ≤0.25 ≤0.08
25MnG 0.23～0.27 0.17～0.37 0.70～1.00 ≤0.030 ≤0.030 ≤0.25 ≤0.15 ≤0.20 ≤0.25 ≤0.08
15CrMo 0.12～0.18 0.17～0.37 0.40～0.70 ≤0.030 ≤0.030 0.80～1.10 0.40～0.55 ≤0.20 ≤0.30
12Cr2MoG 0.08～0.15 ≤0.50 0.40～0.70 ≤0.030 ≤0.030 2.00～2.50 0.90～1.20 ≤0.20 ≤0.30
12Cr1MoV 0.08～0.15 0.17～0.37 0.40～0.70 ≤0.030 ≤0.030 0.90～1.20 0.25～0.35 ≤0.20 ≤0.30 0.15～0.30
10Cr9Mo1VNb 0.08～0.12 0.20～0.50 0.30～0.60 ≤0.020 ≤0.010 8.00～9.50 0.85～1.05 ≤0.20 ≤0.40 0.18～0.25 ≤0.015 0.06～0.10 0.03～0.07
ASME SA106 SA106B 0.17～0.25 ≥0.1 0.70～1.00 ≤0.030 ≤0.030
SA106C 0.23～0.27 ≥0.1 0.70～1.00 ≤0.030 ≤0.030
ASME SA333 SA333Ⅰ 0.09～0.12 / 0.7～1.00 ≤0.020 ≤0.010
SA333Ⅵ 0.09～0.12 ≥0.1 0.9～1.10 ≤0.020 ≤0.010
ASME SA335 SA335 P11 0.05～0.15 0.50～1.0 0.30～0.60 ≤0.030 ≤0.030 1.00～1.50 0.50～1.00
SA335 P12 0.05～0.15 ≤0.50 0.30～0.61 ≤0.030 ≤0.030 0.80～1.25 0.44～0.65
SA335 P22 0.05～0.15 ≤0.50 0.30～0.60 ≤0.030 ≤0.030 1.90～2.60 0.87～1.13
SA335 P5 ≤0.15 ≤0.50 0.30～0.60 ≤0.030 ≤0.030 4.00/
6.00		 0.45/
0.65
SA335 P91 0.08～0.12 0.20～0.50 0.30～0.60 ≤0.020 ≤0.010 8.00～9.50 0.85～1.05 ≤0.40 0.18～0.25 ≤0.015 0.06～0.10 0.03～0.07
SA335 P92 0.07～0.13 ≤0.50 0.30～0.60 ≤0.020 ≤0.010 8.50～9.50 0.30～0.60 0.30～0.60 ≤0.40 0.15～0.25 ≤0.015 1.50～2.00 0.04～0.09 0.03～0.07
DIN 17175 ST45.8/Ⅲ ≤0.21 0.10～0.35 0.40～1.20 ≤0.040 ≤0.040 ≤0.30
15Mo3 0.12～0.20 0.10～0.35 0.40～0.80 ≤0.035 ≤0.035 0.25～0.35
13CrMo44 0.10～0.18 0.10～0.35 0.40～0.70 ≤0.035 ≤0.035 0.70～1.10 0.45～0.65
10CrMo910 0.08～0.15 ≤0.50 0.30～0.70 ≤0.025 ≤0.020 2.00～2.50 0.90～1.10 ≤0.30 ≤0.30 ≤0.015
EN1021 6-2 15NiCuMoNb5-6-4 (WB36) ≤0.17 0.25～0.50 0.80～1.20 ≤0.025 ≤0.020 ≤0.30 0.25～0.50 0.50～0.80 1.00～1.30 ≤0.05 0.015～0.045

Chemical composition and mechanical properties

The reason why 20G is capable of handling high-pressure environments is due to its balanced chemical composition and excellent mechanical properties.

Chemical composition (%):

  • Carbon (C): 0.17~0.23
  • Silicon (Si): 0.17~0.37
  • Manganese (Mn): 0.35~0.65
  • Phosphorus (P): ≤ 0.025
  • Sulfur (S): ≤ 0.015
  • Residual elements such as chromium (Cr), molybdenum (Mo), and nickel (Ni) are also strictly limited.
  • Features: The low-carbon design ensures good welding performance and processing plasticity, while the lower sulfur and phosphorus content improves the purity of the steel and enhances its resistance to high temperature creep.

Mechanical properties:

  • Tensile strength (σ b): ≥ 410 MPa
  • Yield strength (σ s): ≥ 245 MPa
  • Elongation rate (δ): ≥ 24%
  • Impact energy: There are corresponding requirements based on the size.
  • Characteristics: It has sufficient strength and a good combination of plasticity and toughness, and can effectively withstand internal high pressure and external loads.

Main Features And Advantages

  • Excellent high-temperature strength: At the working temperature of the boiler (usually ≤ 450 ° C), 20G can maintain high durability and creep resistance, and is not prone to plastic deformation and fracture.
  • Good antioxidant properties: Its surface can form a dense protective film in high-temperature water vapor, slowing down the rate of further oxidation and corrosion.
  • Excellent process performance: including good cold and hot processing performance such as cold bending, hot bending, and expansion, and more importantly, excellent welding performance, making it easy to install and manufacture on site.
  • High organizational stability: Under long-term high temperature and high pressure, the metallographic structure (ferrite+pearlite) is relatively stable and less prone to aging and performance degradation.

Application areas

  • Power plant boiler
  • Water cooled wall: The vertical shaft pipes around the boiler furnace absorb radiant heat and are the main evaporative heating surface of the boiler.
  • Economizer: uses the heat from the exhaust gas at the tail of the boiler to preheat the feedwater, reduce the exhaust gas temperature, and improve efficiency.
  • Superheater: Heating saturated steam into superheated steam with a certain temperature.
  • Reheater: Heat the steam from the high-pressure cylinder of the steam turbine again and send it back to the intermediate pressure cylinder to continue working.
  • Connecting pipes: such as header connecting pipes, steam connecting pipes, etc.
  • Industrial boilers: Heating surface pipelines and piping systems of medium and high pressure boilers used in various industries such as petrochemicals, textiles, printing and dyeing, and papermaking.
  • Other fields: Can be used for pressure bearing components such as high-pressure vessels and heat exchanger equipment.

Production process flow

The requirements for producing 20G high-pressure boiler tubes are extremely strict, mainly using the production process of hot-rolled or cold drawn (rolled) seamless steel tubes:

Tube billet acceptance → heating → perforation → tube rolling → sizing → cooling → straightening → pipe cutting → non-destructive testing (100% inspection) → mechanical performance testing → metallographic examination → hydrostatic testing → surface inspection and length measurement weighing → painting and packaging.

Among them, non-destructive testing (usually ultrasonic or eddy current testing) and hydrostatic testing are key steps to ensure its pressure safety, ensuring that each steel pipe has no internal defects and can withstand more than 1.5 times the working pressure.

20G High-Pressure Boiler Tube20G High-Pressure Boiler Tube20G High-Pressure Boiler Tube

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20G High-Pressure Boiler Tube

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Product Detail
Brand Name :
Hengxin Zhicheng
Model Number :
High-Pressure Boiler Tube
Certification :
ASTM, GB, ISO, etc.
Place of Origin :
CHINA
MOQ :
1 PCE
Price :
Negotiation
Contact Supplier
20G High-Pressure Boiler Tube
20G High-Pressure Boiler Tube
20G High-Pressure Boiler Tube

Wuxi Hengxin Zhicheng International Trade Co., LTD

Verified Supplier
1 Years
wuxi
Since 2014
Business Type :
Manufacturer, Trading Company
Main Products :
Mechanical Structure Pipe, Conveyor Pipe, Precision Tube
Total Annual :
30000000-50000000
Employee Number :
<300
Certification Level :
Verified Supplier
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