Boiler and Vessel Pipe

Questionable boiler tube is a type of seamless steel cylinder. The manufacturing method is much like that of seamless tube, but it is manufactured with high requirements of steel. It is often used in high temperature and high pressure conditions and high temperature flue gas and steam allow it to easy to be corroded.

Boiler tubes are designed with high endurance strength, high oxidation corrosion resistance performance and high sturdiness. This high pressure seamless steel pipe is mainly used in manufacturing superheater tube, reheater tube, gas-guide tube and main steam pipe in high pressure and ultrahigh pressure boilers. Low and medium pressure boiler tube is made through difficult . of punching steel ingot or solid pipe billet into hollow billet, hot rolling, and cold rolling or cold drawing.
Manufacturing Process of Seamless Steel Pipe for BoilerWe adopt hot rolling, cold drawing and hot expanding manufacturing procedures.
Standards There made for professionals three standards for boiler tubes including ASME SA106, ASME SA210, ASME SA213 and DIN17175 requirements.
ApplicationsJST seamless steel pipe can be employed as heating surface pipe, economizer, superheater, reheater, petrochemical industrial pipe and others in high pressure boilers (The working pressure is above 9.8 Mpa as well as the working temperature is between 450℃ to 650℃.). It also can be applied on the heating surface pipe in low and medium pressure boilers (The working pressure is not throughout 5.88 Mpa and also the working temperature is below 450℃.).

Mechanical Properties of Boiler Tube

Standard Grade Tensile Strength (Mpa) Yield Strength (Mpa) Elongation (%) Hardness
ASME SA210 SA210A-1 ≥415 ≥255 ≥30 ≤143HB
ASME SA210 SA210C ≥485 ≥275 ≥30 ≤179HB
ASME SA213 SA213 T11 ≥415 ≥205 ≥30 ≤163HB
ASME SA213 SA213 T12 ≥415 ≥220 ≥30 ≤163HB
ASME SA213 SA213 T22 ≥415 ≥205 ≥30 ≤163HB
ASME SA213 SA213 T23 ≥510 ≥400 ≥20 ≤220HB
ASME SA213 SA213 T91 ≥585 ≥415 ≥20 ≤250HB
ASME SA213 SA213 T92 ≥620 ≥440 ≥20 ≤250HB
DIN17175 ST45.8/Ⅲ 410~530 ≥255 ≥21 /
  20 410~550 ≥245 ≥20 /
  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 /
  15Mo3 450~600 ≥270 ≥22 /
  13CrMo44 440~590 ≥290 ≥22 /
  10CrMo910 480~630 ≥280 ≥20 /

Established in 1984, Jiangyin Changjiang Steel Tube Making Factory has been engaged in manufacturing mechanical steel pipes for about 30 years. We mainly supply structure pipe, fluid pipe, high pressure boiler pipe, API pipe, marine pipe, alloy pipe, tubing, casing, line pipe, etc. Our mechanical steel tubings are extensively used in metallurgy, port, ship-breaking, manufacturing, chemical engineering, transportation and other industries. They are well appreciated for their advanced design, sophisticated manufacturing, excellent quality and full service.

Seamless Steel Pipe for Pressure Vessel

Standard: JIS G3429 We mainly produce different grades of seamless steel pipes for pressure vessel, such as 37Mn, 34Mn2V, 30CrMo, 35CrMo, STH11, STH12, STH21, STH22, etc.

Applications This seamless steel tube is mainly used for the production of fuel gas or hydraulic cylinders, high pressure vessel and cylinder seamless steel pipe.

Steel Manufacturing Method Our steel is smelted by electric furnace or oxygen converter.

Manufacturing Method of Steel Pipe Seamless steel pipe for pressure vessel is made by hot rolling or cold rolling (cold drawing) methods.

Delivery Condition Hot-rolled steel pipe is delivered in hot-rolled condition, while cold-rolled steel tubes are delivered in normalized or annealed conditions.

Chemical Composition

Standard Grade Chemical Composition
C Si Mn P、S Cu Ni Mo Cr V
JIS G3429 STH11 ≤ 0.50 0.10-0.35 ≤ 1.80 ≤ 0.035 / / / / /
STH12 0.30-0.41 0.10-0.35 1.35-1.70 ≤ 0.030 / / / / /
STH21 0.25-0.35 0.15-0.35 0.40-0.90 ≤ 0.030 / ≤ 0.25 0.15-0.30 0.80-1.20 /
STH22 0.33-0.38 0.15-0.35 0.40-0.90 ≤ 0.030 / ≤ 0.25 0.15-0.30 0.80-1.20 /

 

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