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Non-destructive testing of seamless pipes for 34CrMo4 gas cylinders

  34CrMo4 grade pipe is a special seamless pipe for gas cylinder steel that meets the Chinese national standard GB/T 18248. It can be used as fuel pipeline, hydraulic pipeline and station gas cylinder pipeline. GB/T18248 34CrMo4 air bottle pipes Chemical Composition Grade C Si Mn P S P+S Cr Mo V Ni Cu 34CrMo4 0.30-0.37 0.15-0.35 0.60-0.90 ≤0.020 ≤0.010 ≤0.025 0.90-1.20 0.15-0.30 - ≤0.30 ≤0.20 Non-destructive testing of seamless pipes for 34CrMo4 gas cylinders : 1. When using the electromagnetic testing method to test the compactness, the 34CrMo4 steel pipes should be ultrasonically tested one by one. When the compactness is checked by hydraulic test, the steel pipes shall be subjected to ultrasonic testing or magnetic flux leakage testing one by one. 2. When 34CrMo4 gas cylinder tubes are subjected to ultrasonic testing, the acceptance level shall comply with the provisions of U2 in GB/T 5777-2019, in which the minimum groove depth category for hot-rolled (expanded) steel pipes is ...
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Surface Quality of Seamless Tubes for 35CrMo Gas Cylinders

  The 35CrMo grade pipe is a special seamless pipe for gas cylinder steel that complies with the Chinese national standard GB/T 18248. It can be used as fuel pipeline, hydraulic pipeline and station gas cylinder pipeline. GB/T18248 35CrMo air bottle pipes Chemical Composition and Mechanical Property Grade C Si Mn P S P+S Cr Mo V Ni Cu 35CrMo 0.32-0.40 0.17-0.37 0.40-0.70 ≤0.020 ≤0.020 ≤0.030 0.08-1.10 0.15-0.25 - ≤0.30 ≤0.20   Grade Yieldstrength(MPa), min Tensilestrength(Mpa), min Elongation(%), min 35CrMo 835 980 12 Surface Quality of 30CrMo Gas Cylinder Seamless Tube : 1. The inner and outer surfaces of seamless pipes for 1.35CrMo gas cylinders should not have visible cracks, folds, pinches, delaminations and scars. These defects should be completely removed, and the removal depth should not exceed 10% of the wall thickness, and the actual wall thickness of the cleaned part should not be less than the minimum value allowed by the wall thickness, and the removed part should ...
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Smelting method of seamless pipe for 30CrMo gas cylinder

  The 30CrMo grade pipe is a special seamless pipe for gas cylinder steel that complies with the Chinese national standard GB/T 18248. It can be used as fuel pipeline, hydraulic pipeline and station gas cylinder pipeline. The 30CrMo gas cylinder seamless pipe we can provide usually has a length of 4000 mm~12000 mm. Steel pipes with a length greater than 12000mm or shorter than 4000mm but not shorter than 3000mm can also be delivered; for steel pipes with a length shorter than 4000mm, the quantity should not exceed 5% of the total number of steel pipes delivered in this batch. within standard specifications. GB/T18248 30CrMo air bottle pipes Chemical Composition and Mechanical Property Grade C Si Mn P S P+S Cr Mo V Ni Cu 30CrMo 0.26-0.34 0.17-0.37 0.40-0.70 ≤0.020 ≤0.020 ≤0.030 0.08-1.10 0.15-0.25 - ≤0.30 ≤0.20   Grade Yieldstrength(MPa), min Tensilestrength(Mpa), min Elongation(%), min 30CrMo 785 930 12 30CrMo cylinder seamless tube smelting method: 1. The steel should be refi...
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ASME SA192M SA192 High Pressure Seamless Carbon Steel Boiler Piping

  SA192 is a minimal wall thickness seamless carbon steel boiler and superheater tube for high pressure applications. We usually provide the size range: outer diameter 12.7~- 177.8mm, minimum wall thickness 2.2 ~ 25.4mm, and can also be customized according to customer needs. SA192 pipes conforming to the ASME SA192M standard shall be manufactured in a seamless process and can be hot or cold worked according to the application. Hot rolled tubes do not need to be heat treated. cold drawn tube at the end After cold drawing, it should be heat treated at 650°C or higher. The chemical composition of SA192 steel shall meet the following requirements: C, % 0.06~0.18 Mn, % 0.27~0.63 P, % ≤0.035 S, % ≤0.035 Si, % ≤0.25 Mechanical test of SA192 seamless pipe support 1. Flattening test 2. Flaring test 3. Hardness test 4. Hydrostatic test The SA192 seamless boiler tube inserted into the boiler should be able to withstand expansion and crimping without cracks and hairlines. Superheater tubes sh...
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ASME SA210M medium carbon boiler seamless pipe

  ASME SA210M is a medium carbon steel pipe standard, which stipulates that this type of pipe is mainly used for boilers, superheater pipes, etc. There are two grades, namely SA210A1 and SA210C, A1 grade C content 0.27%, Mn up to 0.93%, C grade up to 0.35% carbon content, manganese content 0.29-1.06%. It has good strength and durability. It is a kind of pipe with high cost performance. The ASME SA210M standard supply size is thickness 12.7 -127 mm, outer diameter 0.9 - 12.7mm, if you have other desired sizes, you can also communicate with us, we will try our best to meet your requirements. Chemical Composition: Standard Grade chemical composition: C Si Mn P S ASTM A210 A-1 ≤0.27 ≥0.10 ≤0.93 ≤0.035 ≤0.035 C ≤0.35 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 Tensile Requirements:   Mechanical  Properties Grade A-1 Grade C   Tensile strength, min, ksi [MPa] 60 [415] 70 [485]   Yield strength, min, ksi [MPa] 37 [255] 40 [275]   Elongation in 2 in. or 50 mm, min, % 30 30 ...
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JIS G3461 STB 340 carbon steel pipes for boilers and heat exchangers

  STB 340 pipes comply with JIS G3461 standards and can be used as boiler pipes, heat exchangers and pressure vessel pipes, etc., to transport high-temperature gases and liquids. We can perform resistance welding, cold processing, hot processing and other processing on STB 340 seamless pipes. The size range of STB 340 grade boiler pipes: Wall thickness (WT): 2.0mm—12.7mm Outer diameter (OD): 25mm—139.8mm Length: 6M Sizes can also be customized according to specific conditions of use. Heat Treatment of JIS G3461 STB 340 Grade Heat treatment Hot finished seamless steel tube Cold finished seamless steel tube Electric resistance welded steel tube other than hot finished or cold finished steel tube Finished electric resistance welded steel tube Fold  finished  electric resistance welded steel tube STB 340 As manufactured, as required, low temperature  annealing  or normalizing may be performed. Low temperature annealing,normalizing or full annealing. Normal...
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SA335 P91 Superalloy Tube Heat Treatment Requirements

  P91 is a grade that conforms to the ferritic alloy ASME SA335 standard for high temperature seamless pipes, and it is also a grade that we sell well. CHEMICAL COMPOSITION OF ALLOY STEEL P91 PIPES Grade P91 C, % Mn, % P, % S, % Si, % Cr, % Mo, % UNS K91560 0.12 max 0.30-0.60 0.02 0.01 0.5 max 8.0-9.5 0.85-1.05   MECHANICAL PROPERTIES OF ALLOY STEEL P91 PIPES Tensile Strength, MPa Yield Strength, MPa Elongation, % 585 min 415 min 20 min One difference between P91 and other grades is the difference in heat treatment temperature: Except when the buyer specifies Supplementary Requirement S7, grade P91 steel pipe is normalized at a minimum temperature of 1040°C and tempered at a minimum temperature of 730°C as the final heat treatment. For thicknesses above 3 in., when mutually agreed by the steel mill and the buyer, the following conditions are permitted. Liquid quenching plus tempering instead; in this case the final heat treatment of the steel pipe shall be quenched at a minimu...
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