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GB5310 12Cr1MoVG high pressure boiler tube

Attention:     Issuing time:2019-11-13 17:24

GB5310 12Cr1MoVG High Pressure Boiler Tube

Standard:GB 5310

GB 5310 12Cr1MoVG is applicable to seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines.



 
Steel grade
20G, 20MnG, 25MnG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb.
 


GB 5310 12Cr1MoVG Seamless steel tubes and pipes for high pressure boiler
12Cr1MoVG is a Cr-Mo-V low alloy heat-resistant steel introduced from the Soviet Union in the 1950s and 1960s. Vanadium is an element that reduces the y-phase region. When dissolved in y-fe, it will inhibit the transformation of ADI to pearlite, which is beneficial to the formation of ADI. The total amount of alloy in 12Cr1MoVG steel is only one half of that of 2.25Cr-1Mo steel, but the endurance strength (580 ° C) is 1.4 times of that of 2.25Cr-1Mo steel. Similar steel grades widely used abroad include ASTM a405 p24 in the United States, bs3604 in the United Kingdom, DIN 13crmov42 in Germany, etc.



 
GB5310 12Cr1MoVG high pressure boiler tube Specification
Type:Seamless Steel Pipe. 
Material:12Cr1MoVG.
WT:5-200mm. 
OD:10-1500mm
Length:6M or specified length as required. 
Ends:Plain End、Beveled End、Treaded

 
Additional Info
Payment Terms:T / T, LC
Surface:Tubes will be varnished (Outside only) to prevent rust.
Marking:Standard + Steel Grade + Size + Heat No + Lot No
Package:According To Per Customers' Require
Delivery time:Tubes will be completed within 30 days, and urgent delivery time can be discussed.



Steel pipe production process: Hot rolled, Cold drawn

 
Delivery status of GB 5310 12Cr1MoVG high-pressure boiler tubes
The steel pipe shall be delivered in a heat treated condition.

Heat treatment:
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.



GB5310 12Cr1MoVG high pressure boiler tube Chemical Composition

Grade C Si Mn P S Cr Mo Cu Ni V
12Cr1MoVG 0.18~0.24 0.17-0.37 0.40~0.70 ≤0.03 ≤0.03 0.90~1.20 0.25~0.35 ≤0.20 ≤0.30 0.15~0.30


GB5310 12Cr1MoVG high pressure boiler tube Mechanical property

Standard grade Tensile Strength(MPa) Yield Strength(MPa) Elongation(%) Hardness(HB)
GB5310 12Cr1MoVG 470~640 ≥255 ≥ 21 /




Application
Limit service temperature: gb5310 12Cr1MoVG alloy steel seamless steel pipe is mainly used for boiler superheater, reheater and other heating surface piping systems with metal wall temperature not exceeding 580 ° C, boiler header and main steam pipe and other pressure parts with metal wall temperature not exceeding 565 ° C.
 

Use guide:
DL / T 5054-2016 selection of temporary pipes and accessories
For the temporary pipe with design temperature no more than 450 ℃, the pipe material can be 20g. When the temporary pipe is reused, metal supervision shall be strengthened. Alloy steel, such as 12Cr1MoVG, can be used when the cause of temporary pipeline layout, the calculation of piping stress is unqualified or the owner requires.
 



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%



Allowable Tolerance of the minimum wall thickness specified in the steel pipe

Type of steel pipe Wall thickness range Tolerance
ordinary advanced
Hot rolled tube WTmin≤4.0 +0.8
O
+0.6
O
WTmin>4.0 +20%S
0
+15%S
0
Cold drawn tube WTmin≤2.8 +0.4
O
WTmin>2.8 +15%S
0




 
Surface quality of GB5310 12Cr1MoVG high-pressure boiler tubes
The inner and outer surfaces of steel pipes are not allowed to have cracks, folds, crusting, rolling and separation. These defects shall be completely removed and the depth of defect removal shall not exceed 10% of the wall thickness. The actual outer diameter and wall thickness of the defect removal shall not be less than the minimum allowable for the outer diameter and wall thickness.
 
The allowable depth or height of the straight road on the inner and outer surfaces of the steel pipe shall comply with the following requirements:
a) cold drawn (rolled) steel pipe: not more than 4% of the nominal wall thickness, and the maximum is 0.2 mm;
b) Hot-rolled (extruded, expanded) and forged steel pipes: not more than 5% of the nominal wall thickness and a maximum of 0.4 mm.
 



Summary of  testing
Hydraulic test
Flattening test
Bending test
Flaring test
Low-power test
Non-metallic inclusions
Grain size
Microstructure
Decarburization layer
Intergranular corrosion test
Non-destructive testing
 


Welding process
Welding materials: manual welding, gas tungsten electrode and melting electrode automatic welding or submerged arc automatic welding can be used. Argon arc welding can be used for backing, manual welding or automatic welding of cover surface for small diameter and high thin wall; argon arc welding can be used for backing and submerged arc self welding cover surface for large diameter and high girth weld of boiler header, while inner hole argon arc welding backing hand and manual welding cover surface can be used for welding of pipe seat weld. E551s-b2-v (r317) electrode is used for manual arc welding and h08crmov electrode is used for automatic welding. Although the steel has good weldability, it has the tendency of cold cracking and brittleness and hardness. It should be preheated at 200-25 ℃ before welding (it can not be preheated before welding of small caliber and thin wall). After welding, it should be stress relief heat treatment at 700-740 ℃.




GB5310 12Cr1MoVG seamless steel pipe Packaging & Delivery

 
Types of Packaging:
 
- Bundles (hexagonal)
- Wooden Boxes
- Crates (steel/wooden)
- Special crates for U-Bend tubes with each radius separated
- Our GB5310 12Cr1MoVG seamless steel pipe packing can meet any needs of the customers.

 
Delivery: 7-15 days after payment


 


we can supply different materials for GB 5310 high-pressure boiler tubes as seamless pipe, expecially 12Cr1MoVG boiler tubes.




Contact:Dirk  

whatapp: +8615003211561,

E-mail:jinxiaolong0221@gmail.com ,beitesteelpipe@gmail.com


Contact:Lucky

whatapp: +8615003171886

E-mail:jinxiaolong0221@gmail.com ,beitesteelpipe@gmail.com


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