Tianjin Zhongjian Huadian Steel Co., Ltd.
Seamless Steel Pipe Department Tel: 022-26818163 86658109 Fax: 022-26916479
High-pressure Boiler Tube Department Tel: 022-26738163 86659638 Fax: 022-26916479
Petroleum Cracking Tube Department Tel: 022-26719948 86659738 Fax: 022-86658121
General Manager: Miao Zonghui
Mobile: 13752381288 15332138381
Website: http://www.gb5310-2008.com
Mechanical Properties:
Standard Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Impact Energy (J) Brinell Hardness (HB) Delivery Condition
GB9948 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
Main Material Composition:
10#(st35), 20#(st45), 35#(st55), 45#(st45), 16Mn(st52), etc. According to DIN2391-81 standard, the outer diameter tolerance is ±0.08-0.10mm, inner diameter tolerance is ±0.10-0.15mm, wall thickness tolerance is ±0.10-0.15mm.
Chemical Composition:
Standard Grade Chemical Composition (%)
C Si Mn P S Cr Mo Ni
GB9948 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
GB5310 -2008—— China National Standard High-pressure Boiler Tube
(Seamless steel pipe for high pressure boilers) ASME SA106-------American Boiler and Pressure Vessel Specification ASME SA210 —— American Boiler and Pressure Vessel Specification ASME SA213 —— American Boiler and Pressure Vessel Specification DIN17175 —— Federal German Industrial Standard
Usage of High-pressure Boiler Tubes:
Used in heat-absorbing pipes of low and medium pressure boilers (working pressure generally not more than 5.88Mpa, working temperature below 450℃); used in heat-absorbing pipes, economizers, superheaters, reheaters, and petrochemical industry pipes of high pressure boilers (working pressure generally above 9.8Mpa, working temperature between 450℃～650℃).
Specifications and Appearance Quality:
According to GB5310-95, the outer diameter of high-pressure boiler tubes ranges from 22～530mm, wall thickness from 20～70mm. Cold-drawn (cold-rolled) tubes have an outer diameter of 10～108mm, wall thickness of 2.0～13.0mm.
Main Grades:
The current total production and consumption of high-pressure boiler tubes are significant. Many manufacturers produce high-pressure boiler tubes, especially those producing 20G, with a total production capacity of about 200,000 tons. However, only a few manufacturers truly have the production capability, with a capacity of about 150,000 tons. The actual production in 1998 was less than 100,000 tons. The current market share is 41%, while the demand from the boiler industry is not strong.
Φ10～1066mm specification steel pipes can be supplied. For a long time, the main steel grades have been 20G, 12Cr1MoV, G102. In the future, the main steel grades will be 20G, 12Cr1MoV, T91 (P91), TP347H. Domestically, T91 (P91) and TP347H are still in the trial production stage.
Demand for high-pressure boiler tubes is closely related to the development of thermal power. In 1995, the installed capacity in China reached 200 million kW. According to government plans, it will reach 290 million kW by 2000, i.e., adding 16 million kW per year. Among them, thermal power (calculated at 75%), adds 12 million kW per year. Boiler manufacturing consumes 100 tons of high-pressure boiler tubes per 10,000 kW, resulting in an annual consumption of 120,000 tons. Due to the import of complete boilers, the actual consumption is less than this number. Adding the needs of power station construction (1.7t/10,000kW), maintenance of existing thermal power units (6.5t/10,000kW), and the need for steel pipes with similar performance requirements as high-pressure boiler tubes, the estimated annual consumption in recent years is approximately 300,000 tons. With the increase in existing capacity, the demand for maintenance will become the largest in the future.
As high-pressure boilers develop towards higher performance parameters and extended service life, the requirements for steel grades are increasingly stringent, and domestic research on new materials and pipe making lags behind the needs.
Grades include: 10, 20, 20G, 20MnG, 25MnG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, SA210A1, SA210C, SA213 T11, SA213 T12, SA213 T22, SA213 T23, SA213 T91, SA213 T92, ST45.8/Ⅲ, 15Mo3, 13CrMo44, 10CrMo910, etc.
Dimensional Tolerances:
Type Outer Diameter (D) Wall Thickness (S)
Cold-drawn tube Outer Diameter (mm) Allowed Deviation (mm) Wall Thickness (mm) Allowed Deviation (mm)
>30～50 ±0.3 >3～20 ±10%
Weight Calculation Formula for High-pressure Boiler Tubes:
[(Outer Diameter - Wall Thickness) * Wall Thickness] * 0.02466 = kg/m (weight per meter)
Mechanical Properties:
Standard Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness
GB3087 10 335～475 ≥195 ≥24 /
20 410～550 ≥245 ≥20 /
GB5310 20G 410～550 ≥245 ≥24 /
20MnG ≥415 ≥240 ≥22 /
25MnG ≥485 ≥275 ≥20 /
15CrMoG 440～640 ≥235 ≥21 /
12Cr2MoG 450～600 ≥280 ≥20 /
12Cr1MoVG 470～640 ≥255 ≥21 /
12Cr2MoWVTiB 540～735 ≥345 ≥18 /
10Cr9Mo1VNb ≥585 ≥415 ≥20 /
ASME SA210 SA210A-1 ≥415 ≥255 ≥30 ≤143HB
SA210C ≥485 ≥275 ≥30 ≤179HB
ASME SA213 SA213 T11 ≥415 ≥205 ≥30 ≤163HB
SA213 T12 ≥415 ≥220 ≥30 ≤163HB
SA213 T22 ≥415 ≥205 ≥30 ≤163HB
SA213 T23 ≥510 ≥400 ≥20 ≤220HB
SA213 T91 ≥585 ≥415 ≥20 ≤250HB
SA213 T92 ≥620 ≥440 ≥20 ≤250HB
DIN17175 ST45.8/Ⅲ 410～530 ≥255 ≥21 /
15Mo3 450～600 ≥270 ≥22 /
13CrMo44 440～590 ≥290 ≥22 /
10CrMo910 480～630 ≥280 ≥20 /
Chemical Composition:
Standard Grade Chemical Composition (%)
C Si Mn P S Cr Mo Cu Ni V Al W Ti 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 0.17～0.24 0.17～0.37 0.70～1.00 ≤0.030 ≤0.030 ≤0.25 ≤0.15 ≤0.20 ≤0.25 ≤0.08 /