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{"title":"Heavy Wall Seamless Welded Carbon Steel Pipe A\/SA106B\/C A\/SA53B Standard Long","imgUrl":"https:\/\/img.chinax.com\/nimg\/ab\/c9\/9462bf309c0a98a6b05415e59bd7-200x200-1\/heavy_wall_seamless_welded_carbon_steel_pipe_a_2fsa106b_2fc_a_2fsa53b_standard_long_lifespan.jpg","attrs":{"Brand Name":"BEST","Model Number":"1\/2''-48''","Certification":"API, CE, PED, ISO","Place of Origin":"China\/Japan"}}
{"title":"EN10028 E355 Material Alloy Steel Seamless Pipes Heavy Wall Tubes Round Shape","imgUrl":"https:\/\/img.chinax.com\/nimg\/67\/8f\/e52b13079181d6f4f5346cfd83b5-200x200-1\/en10028_e355_material_alloy_steel_seamless_pipes_heavy_wall_tubes_round_shape.jpg","attrs":{"Brand Name":"Thyssenkrupp Material","Model Number":"40x40inch","Certification":"APZ3.1 Certificates","Place of Origin":"Italy"}}
JIS G3429 STH11/12 STH21/22 STH31 Seamless Steel Tubes for High Pressure Gas Cylinder
These grades – STH11/12, STH21/22, STH31 – are tube/pipe steel designations used in heat-exchanger and boiler applications, closely mapping to well-known international grades. While exact composition varies by standard and manufacturer, they can be understood through comparison to common reference steels.
STH21/22: Low-alloy Cr-Mo tube steels for higher temperatures
STH31: Higher-Cr-Mo heat-resistant tube steel for demanding conditions
Important: For any engineering, welding, or safety-critical decisions, always confirm the exact chemistry from the relevant standard or manufacturer's certificate rather than using approximate data alone.
