GB 5310 12Cr1MoVG High Pressure Seamless Boiler Tubes

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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.

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GB 5310 12Cr1MoVG High Pressure Boiler Tubes
 
Standard:GB 5310
Seamless steel tubes and pipes for high pressure boiler

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.
 
 
GB 5310 12Cr1MoVG High Pressure Boiler Tubes Quick Details
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.8 mm——150 mm.
Outer diameter (OD): 23 mm——1500 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
 
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
 
 
Manufacturing methods
(1)Steel smelting method
GB 5310 12Cr1MoVG steel will be smelted by electric furnace plus furnace refining, oxygen converter plus furnace refining or electroslag remelting method.
(2)Manufacturing methods and requirements for tube blanks
The tube blank can be produced by continuous casting, die casting or hot rolling (forging).
Forging and rolling: the initial forging temperature is 1180-1145 ℃, and the final forging temperature is greater than 850 ℃. After forging, stack cooling is required.

(3)Manufacturing method of steel tube
GB 5310 12Cr1MoVG Steel tubes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling).

Cold and hot processing: small diameter steel pipes can be cold bent without heat treatment after bending. Large diameter thin-walled tube can be cold bent, after bending, it needs to do high temperature heat treatment. Large diameter thick wall pipe needs hot bending. The heating temperature of the hot bend is 980 ° C, and the final bending temperature is more than 800 ℃. After bending, it needs normalizing and adding back
 
 
 
Classification, code
a) Hot rolled steel pipe, codenamed WH;
b) Cold drawn steel pipe, codenamed WC.
 
 
Delivery status
The steel tubes shall be delivered in a heat treated condition.
 

Heat treatment for GB 5310 12Cr1MoVG High Pressure Boiler Tubes
 
Grade Heat treatment
12Cr1MoVG 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.
 
 

Chemical composition of GB 5310 12Cr1MoVG
Grade Chemical Composition(%)
C Si Mn Cr Mo V Ni Cu P S
Max
12Cr1MoVG 0.08～0.15 0.17～0.37 0.40～0.70 0.90～1.20 0.25～0.35 0.15～0.30 ≤0.30 ≤0.20 0.025 0.020
 
 
Mechanical properties of GB 5310 12Cr1MoVG
Steel Pipe Tensile properties Impact energy(Akv)，J
Tensile strength
(MPa)		 Yield Strength
(MPa)		 Elongation
%		 Portrait Landscape
Portrait Landscape
  Max
12Cr1MoVG 470～640 255 21 19 40 27
 
The annual oxidation corrosion rate of 12Cr1MoVG steel in hot air is 0.042-0.050 mm / year at 580 ° C and 0.129-0.220 mm / year at 600 ° C.


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 ℃.


 
Allowable deviation 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
(1)Hydraulic test
The steel pipe shall be hydraulically tested one by one, and the eddy current testing can instead of the hydraulic test.
(2)Flattening test
Steel pipes with an outer diameter greater than 22 mm to 400 mm and a wall thickness not greater than 40 mm shall be subjected to a flattening test.
(3)Bending test
Steel pipes with an outer diameter greater than 400 mm or a wall
(4)Flaring test
The steel pipe with an outer diameter of not more than 76 mm and a wall thickness of not more than 8 mm can be used for the flare test.
(5)Low-power test
Steel pipes should be tested at low magnification. Visually visible white spots, inclusions, subcutaneous bubbles, tumbling and delamination are not allowed on the cross-section acid immersion test piece.
(6) Non-metallic inclusions
Steel pipes shall be tested for non-metallic inclusions.
(7)grain size
The finished steel pipe should be tested for grain size.
(8)Microstructure
The finished steel pipe with the grades 15MoG will be ferrite plus pearlite, allowing the presence of granular bainite, and no phase change critical temperature between AC1 and AC3 is allowed.
Complete phase change product (such as yellow bar martensite); the finished steel pipe of grade 12Cr1MoVG allows the presence of sorbite;
(9)Decarburization layer
Cold drawn (rolled) finished steel pipes with an outer diameter of not more than 76 mm shall be inspected for the total decarburization layer.
(10)Non-destructive testing
The steel pipe shall be ultrasonically inspected and tested in accordance with the provisions of GB/T 5777.
 

 
Surface quality
The inner and outer surfaces of steel pipes do not 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.
 
 
End shape
The end faces of the steel pipe should be perpendicular to the axis of the steel pipe, and the incision burrs swill be removed.
 

Packaging, marking and quality instructions
The packaging, marking and quality specifications of steel pipes shall comply with the provisions of GB/T 2102.


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.

Recommendations for selecting materials for boiler water walls of ultra-supercritical units:
1. The designed outlet temperature of the boiler is ≤570℃, and 12CrMoG, 15CrMoG, 12Cr1MoVG and similar steel pipes can be used as the water-cooled wall steel.
2. The designed outlet temperature of the boiler is less than or equal to 600℃, and 12Cr1MoVG, T23, T24 steel pipes can be used as the water-cooled wall steel.
3. The designed outlet temperature of the boiler is ≤620℃, and T23 and T24 steel pipes can be used as the steel for the water-cooled wall.
 
Shanghai Boiler Factory has introduced Siemens boiler manufacturing technology. The steels for ultra-supercritical boiler water walls currently being manufactured are: SA209-T1, SA213-T12, SA213-T23; Harbin Boiler Factory has introduced boiler manufacturing technology from Japan’s Mitsubishi Company and is currently manufacturing The steel for the water wall of the ultra-supercritical boiler is: 15CrMoG; Dongfang Boiler Factory has introduced the boiler manufacturing technology of Japan Hitachi, and the steel for the water wall of the ultra-supercritical boiler is currently being manufactured: SA213-T12, SA213-T2, SA213-T22; Beijing The steel for the water wall of ultra-supercritical boilers currently being manufactured by Bavi Company is: SA213-T12, 15CrMoG.



 
Photos of GB 5310 12Cr1MoVG High Pressure Boiler Tubes
 
    
 
Ordering content
Contracts or orders for ordering steel pipes include the following:
a) standard numbe:GB 5310r;
b) product name:Seamless steel tubes;
c)Grade :12Cr1MoVG;
d) the quantity ordered (total weight or total length);
e) Dimensions (outer diameter × specified minimum wall thickness or outer diameter × average wall thickness in millimeters);
f) Special requirements.

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