Joho Steel Co., Ltd
JOHO STEEL CO.,LTD, founded in 1988, is a steel group which has integrated steel production, processing and trading into one. We specializes in manufacturing carbon seamless steel pipes, boiler tube
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Boiler Tube
Application: For high, middle, low pressure boiler and pressure purpose, Boiler/heat exchanger/pressure vessel/oil/gas/chemical industry/auto/gas cylinder pipe/petroleum cracking etc
Production Standard
ASTM A 106 Grade A, B, C
ASTM A53 Grade A, B
ASTM A178 Grade A, C, D
ASTM A192
ASTM A210 Grade A-1, C
BS3059-I 320 CFS
BS3059-II 360, 440, 620-460, 622-490, S1, S2,TC1, TC2
EN10216-1 P195TR1/TR2, P235TR1/TR2, P265TR1/TR2
EN10216-2 195GH, P235GH, P265GH, TC1,TC2
DIN 17175 ST35.8, ST45.8
DIN 1629 ST37.0, ST44.0, ST52.0
JIS G3454 STPG370, STPG410
JIS G3461 STPG340, STB410, STB440
GB 5310 20G, 15MoG,12CrMoG, 12Cr2MoG, 15CrMoG, 12Cr1MoVG, 12Cr2MoWVTiB
GB9948 10, 20, 12CrMo, 15CrMo
GB3087 10, 20
Surface treatment
Oil, Varnish, Passivation, Phoshating, Shot Blasting
Delivery Condition
Annealed, Nomalized, Normalized and Tempered
Inspections and test
Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Hardness Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, NDT TEST ( ET TEST, UT TEST)