GB/T 5310 12Cr2MoWVTiB High Pressure Boiler Tubes
GB/T 5310 12Cr2MoWVTiB High Pressure Seamless Boiler Tubes
12Cr2MoWVTiB Seamless Steel Tubes
Material introduction
Alias: R102, G102, steel 102 or 102
12Cr2MoWVTiB steel is a kind of multi-element microalloyed low-alloy bainite heat-resistant steel developed by ourselves from the end of 1960s to the middle of 1970s in China. Due to the proper coordination of various alloy elements, the steel has high heat strength, and its heat strength performance and service temperature are higher than those of the same kind of steel abroad. Therefore, 12Cr2MoWVTiB can be used for boiler superheat tube panel and reheat The manufacture of boiler tube and main steam tube, in which superheater tube and reheater tube are called serpentine tube.
Temperature application range: wall temperature ≤ 600 ℃ (620 ℃ can be used when considering oxidation loss in strength calculation)
GB/T 5310 12Cr1MoVG High Pressure Boiler Tubes Quick Details
Manufacture:Seamless process
Specification: 38mm * 5mm, 42mm * 3.5mm, 42mm * 5mm
Length: 6M or specified length as required.
Reference price: 3000-3400usd
Additional Info
Port of Shipment: Tianjin, China
Payment Terms:T / T, LC
Delivery: 7-15 days after payment
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required
Chemical composition of GB/T 5610 12Cr2MoWVTiB
| Grade | C | Si | Mn | Cr | Mo | V |
| 12Cr2MoWVTiB | 0.08-0.15 | 0.45-0.75 | 0.45-0.65 | 1.60-2.10 | 0.50-0.65 | 0.28-0.42 |
| Ti | B | W | P | S | ||
| 0.08-0.18 | 0.002-0.008 | 0.30-0.55 | ≤0.025 | ≤0.015 |
Mechanical properties of GB/T 5610 12Cr2MoWVTiB
| Grade | Tensile strength(MPa) | Yield strength(MPa) | Elongation | Hardness |
| 12Cr2MoWVTiB | 540-735 | ≥345 | ≥18% | --- |
Tolerance of outer diameter and wall thickness
| Type of steel pipe | Outer diameter(mm) | Tolerance | |||
| ordinary | advanced | ||||
| Hot rolled tube | OD | ≤50 | ±0.40 | ±0.30 | |
| ＞50～≤325 | WT≤35 | ±0.75% | ±0.5% | ||
| WT＞35 | ±1% | ±0.75% | |||
| ＞325 | ±1% | ±0.75% | |||
| WT | ≤4.0 | ±0.4 | ±0.3 | ||
| ＞4.0～≤20 | ±10% | ±7.5% | |||
| ＞20 | OD＜219 | ±10% | ±7.5% | ||
| OD≥219 |
+12.5% -10% |
±10% | |||
| Cold drawn tube | OD | ≤25.4 | ±0.15 | — |
| ＞25.4～≤40 | ±0.20 | — | ||
| ＞40～≤50 | ±0.25 | — | ||
| ＞50～≤60 | ±0.30 | — | ||
| ＞60 | ±0.5% | — | ||
| WT | ≤2.8 | ±0.2 | — | |
| ＞2.8 | ±7.5% | — |
Testings of GB/T 5610 12Cr2MoWVTiB
(1)Hydraulic test
(2)Flattening test
(3)Bending test
(4)Flaring test
(5)Low-power test
(6) Non-metallic inclusions
(7)grain size
(8)Microstructure
(9)Decarburization layer
(10)Non-destructive testing
Process performance of 12Cr2MoWVTiB
(1) Forging:
The start temperature of rolling (forging) of 12Cr2MoWVTiB steel is 1150 ~ 1200ec, and the end temperature is 850 ° C. after rolling (forging), the steel is cooled by stacking.
(2) Cold bending
12Cr2MoWVTiB steel is mainly used for small-diameter steel tubes. Generally, the steel pipes need to be cold bent and do not need heat treatment after cold bending.
(3) Heat treatment process (according to GB5310-2008 standard)
Normalizing and tempering: normalizing temperature: 1020ec ~ 1060 ° C; holding for 30min; tempering temperature: 760ec ~ 790ec, holding for 3h; normalizing structure is granular bainite, normalizing + high temperature tempering structure is tempered bainite.
(4) Selection of welding materials:
The weldability of 12Cr2MoWVTiB steel is good. It can be used for manual arc welding, gas welding, friction welding, TIG welding and plasma welding. R347 welding rod is used for manual arc welding, h08cr2movnb welding wire is used for gas welding, butt joint with 12Cr1MoV steel, h08crmov or h08cr2movnb welding wire is used. Neutral partial oxidation flame is suitable for gas welding. After welding, it shall be normalized at 1000-1030 ℃ and tempered at 760-780 ° C. before manual arc welding with thickness greater than 6mm, it shall be preheated to 250-300ec, and tempered at 760-780 ° C after welding. After butt welding, it should be heated to 780ec, kept warm for 40 minutes, and then cooled to below 400ec
Development of 12Cr2MoWVTiB high pressure boiler tube
◆Professor Liu rongzao put forward the theory of multiple composite strengthening in the 1960s, developed G102 (12Cr2MoWVTiB) in the late 1960s and G106 (10cr5mowvtib) in the 1970s
◆Professor Liu rongzao's theory and G102's success, Professor V.K. Sikka of the United States adores very much, and T91 research and development has been successful.
◆T23 (HCM2S, cc2199-3, 6cr2w2monbvnb) developed in Japan and T24 (cc2514, 6cr2mo1vtinb) developed in Europe are all G102 modifications.
In 1982, when Shanghai Boiler Plant and Harbin boiler plant introduced the manufacturing technology of 300MW and 600MW Subcritical controlled circulation boiler from CE company of the United States, CE company of the United States agreed to use 12Cr2MoWVTiB (steel 102) steel pipe instead of TP347H and TP304H steel tubes to manufacture 300MW and 600MW boiler high temperature superheater and reheater. In the superheater, the actual maximum design temperature of 102 steel tube is 580x ℃; in the reheater, the actual maximum design temperature of 102 steel pipe is 599 ℃.
According to DL / t715_, 12Cr2MoWVTiB steel is mainly used for superheater and reheater pipes with wall temperature not higher than 600 ° C; however, according to DL / T 715-2015, it is mainly used for superheater pipes and reheater pipes with wall temperature not higher than 575 ° C. It can be seen that the upper limit of service temperature in 2015 version is 25 ° C lower than that in 2000 version, which may be due to the serious oxidation problem when the steel is used in the steam side of the heating surface tube.
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