Seamless steel tubes for high-pressure boilers in GB/T5310-2017 Standard

Overview Standard: GB/T5310-2017 Alloy Or Not: Alloy Grade Group: 20G、20MnG、25MnG, etc Application: Boiler Pipe Thickness: 1 - 100 mm Surface Treatment: As customer's requirement Outer Diameter(Round): 10 - 1200 mm Technique: Hot Rolled Length: Fixed length or random length(6-12m) Heat treatment: Annealing/normalizing Section Shape: Round Special Pipe: Boiler Pipe Place of Origin: China Usage: Boiler and Heat Exchanger Certification: ISO9001:2008 Test: ECT/UT/Hydrau Static Application It is mainly used to make high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipes for high pressure and above steam boiler pipes. Mainly used for high pressure and high temperature service of boiler(Superheater tube, reheater tube, air guide tube, main steam tube for high and ultra high pressure boilers). Under the action of high temperature flue gas and water vapor, the tube will oxidize and corrode. It is required that the steel pipe has high durability, high resistance to oxidation and corrosion, and good structural stability. Main Grade Grade of high-quality carbon structural steel: 20g、20mng、25mng Grade of alloy structural steel: 15mog、20mog、12crmog、15crmog、12cr2mog、12crmovg、12cr3movsitib, etc Grade of rust-resistant heat-resistant steel: 1cr18ni9     1cr18ni11nb Chemical Component Grade Quality Class Chemical Property C Si Mn P S Nb V Ti Cr Ni Cu Nd Mo B Als" Not more than min Q345 A 0.20 0.50 1.70 0.035 0.035 0.30 0.50 0.20 0.012 0.10 — — B 0.035 0.035 C 0.030 0.030 0.07 0.15 0.20 0.015 D 0.18 0.030 0.025 E 0.025 0.020 Q390 A 0.20 0.50 1.70 0.035 0.035 0.07 0.20 0.20 0.3。 0.50 0.20 0.015 0.10 — — B 0.035 0.035 C 0.030 0.030 0,015 D 0.030 0.025 E 0.025 0.020 Q42O A 0.20 0.50 1.70 0.035 0.035 0.07 0.2。 0.20 0.30 0.80 0.20 0.015 0.20 — — B 0.035 0.035 C 0.030 0.030 0.015 D 0.030 0.025 E 0.025 0.020 Q46O C 0.20 0.60 1.80 0.030 0.030 0.11 0.20 0.20 0.30 0.80 0.20 0.015 0.20 0.005 0.015 D 0.030 0.025 E 0.025 0.020 Q500 C 0.18 0.60 1.80 0.025 0.020 0.11 0.20 0.20 0.60 0.80 0.20 0.015 0.20 0.005 0.015 D 0.025 0.015 E 0.020 0.010 Q550 C 0.18 0.60 2.00 0.025 0,020 0.11 0.20 0.20 0.80 0.80 0.20 0.015 0.30 0.005 0.015 D 0.025 0,015 E 0.020 0.010 Q62O C 0.18 0.60 2.00 0.025 0.020 0.11 0.20 0.20 1.00 0.80 0.20 0.015 0.30 0.005 0.015 D 0.025 0.015 E 0.020 0.010 Except for Q345A and Q345B grades, the steel should contain at least one of the refined grain elements Al, Nb, V, and Ti. According to the needs, the supplier can add one or more refined grain elements, the maximum value Should meet the requirements in the table. When combined, Nb + V + Ti <0.22% °For Q345, Q390, Q420 and Q46O grades, Mo + Cr <0.30% oWhen each grade of Cr and Ni is used as the residual element, the content of Cr and Ni should not be more than 0.30%; when it needs to be added, its content should meet the requirements in the table or be determined by the supplier and the buyer through consultation.J If the supplier can guarantee that the nitrogen content meets the requirements in the table, the nitrogen content analysis may not be performed. If Al, Nb, V, Ti and other alloy elements with nitrogen fixation are added to the steel, the nitrogen content is not limited. The nitrogen fixation content should be specified in the quality certificate. 'When using all aluminum, the total aluminum content AIt ^ 0.020% B Mechanical Property No           Grade                                  Mechanical Property     Tensile MPa Yield MPa Extend L/T Impect (J) Vertical/ Horizontal Handness HB 1 20G 410- 550 ≥ 245 24/22% 40/27 — 2 20MnG 415- 560 ≥ 240 22/20% 40/27 — 3 25MnG 485- 640 ≥ 275 20/18% 40/27 — 4 15MoG 450- 600 ≥ 270 22/20% 40/27 — 6 12CrMoG 410- 560 ≥ 205 21/19% 40/27 — 7 15CrMoG 440- 640 ≥ 295 21/19% 40/27 — 8 12Cr2MoG 450- 600 ≥ 280 22/20% 40/27 — 9 12Cr1MoVG 470- 640 ≥ 255 21/19% 40/27 — 10 12Cr2MoWVTiB 540- 735 ≥ 345 18/-% 40/- — 11 10Cr9Mo1VNbN ≥ 585 ≥ 415 20/16% 40/27 ≤ 250 12 10Cr9MoW2VNbBN ≥ 620 ≥ 440 20/16% 40/27 ≤ 250 Tolerance Wall Thickness and Outter Diameter: If there is no special requirements, pipe gonna be delivery as  norminal outter diameter and norminal wall thickness. As follow sheet Classification designation Method of manufacture Size of pipe Tolerance Normal grade High grade W H Hot Rolled（extrude） pipe Norminal outter Diameter （D） <57 士 0.40 ±0,30 57 〜325 SW35 ±0.75%D ±0.5%D S>35 ±1%D ±0.75%D >325 〜6。。 + 1%D or + 5.Take lesser one一2   >600 + 1%D or + 7,Take lesser one一2   Norminal Wall Thickness （S） <4.0 ±|・丨） ±0.35 >4.0-20 + 12.5%S ±10%S >20 DV219 ±10%S ±7.5%S 心219 + 12.5%S -10%S 土 10%S W-H Thermal expansion pipe Norminal outter Diameter (D) all ±1%D ±0.75%。 Norminal Wall Thickness (S) all + 20%S -10%S + 15%S -io%s W-C Cold drawn(rolled) Ppipe Norminal outter Diameter (D) <25.4 ±'L1j — >25.4 〜4() ±0.20   >40 〜50 |:0.25 — >50 〜60 ±0.30   >60 ±0.5%D   Norminal Wall Thickness (S) <3.0 ±0.3 ±0.2 >3.0 S ±7.5%S   Length: The usual length of steel pipes is 4 000 mm ~ 12 000 mm. After consultation between the supplier and the buyer, and fill in the contract, it can be delivered steel pipes with a length greater than 12 000 mm or shorter than I 000 mm but not shorter than 3 000 mm; short length The number of steel pipes less than 4,000 mm but not less than 3,000 mm shall not exceed 5% of the total number of steel pipes delivered Delivery weight： When the steel pipe is delivered according to the nominal outer diameter and nominal wall thickness or the nominal inner diameter and nominal wall thickness, the steel pipe is delivered according to the actual weight. It can also be delivered according to the theoretical weight. When the steel pipe is delivered according to the nominal outer diameter and minimum wall thickness, the steel pipe is delivered according to the actual weight; the supply and demand parties negotiate. And it is indicated in the contract. The steel pipe can also be delivered according to the theoretical weight. Weight tolerance： According to the requirements of the purchaser, after consultation between the supplier and the purchaser, and in the contract, the deviation between the actual weight and the theoretical weight of the delivery steel pipe shall meet the following requirements: a) Single steel pipe: ± 10%; b) Each batch of steel pipes with a minimum size of 10 t: ± 7.5%. Test Requirement Hydraustatic Test: The steel pipe should be tested hydraulically one by one. The maximum test pressure is 20 MPa. Under the test pressure, the stabilization time should be not less than 10 s, and the steel pipe should not leak. After the user agrees, the hydraulic test can be replaced by eddy current testing or magnetic flux leakage testing. Nondestructive Test： Pipes that require more inspection should be ultrasonically inspected one by one. After the negotiation requires the consent of the party and is specified in the contract, other non-destructive testing can be added. Flattening Test： Tubes with an outer diameter greater than 22 mm shall be subjected to a flattening test. No visible delamination, white spots, or impurities should occur during the entire experiment. Flaring Test:  According to the requirements of the purchaser and stated in the contract, the steel pipe with outer diameter ≤76mm and wall thickness ≤8mm can be done flaring test . The experiment was performed at room temperature with a taper of 60 °. After the flaring, the flaring rate of the outer diameter should meet the requirements of the following table, and the test material must not show cracks or rips Steel Type     Outter diameter flaring rate of steel pipe/% Inner Diameter/Outter Diameter <0.6 >0.6 〜0.8 >0.8 High-quality carbon structural steel 10 12 17 Structural alloy steel 8 10 15 •The inner diameter is calculated for the sample. Product Detail Seamless Steel Tubes For High-Pressure Boilers GB/T5310-2017 ASME SA-106/SA-106M-2015 ASTMA210(A210M)-2012 ASME SA-213/SA-213M ASTM A335/A335M-2018