HOT ASTM 312 904L SMLS Seamless Schedule 40 Pipe Stainless Steel Pipe

904L is an austenitic alloy widely used in high-temperature bearing structures. The high strength of 800H/HT is due to the addition of carbon, aluminum, and titanium and the annealing at a minimum temperature of 1149 ° C to achieve grain size ASTM5 or coarter.

For 800 H/HT under 787 ° C, 82(ER NicR-3) wire is used for welding.R A 330-04(N08334) wire has A matching coefficient of thermal expansion and higher strength. For maximum mechanical strength, use wire 617(ErNICrcomo-1) or wire 117(EnICRcomo-1).

In order to avoid grain boundary cracking caused by possible stress relaxation of 800H/HT welded parts above 538 ° C, post-weld heat treatment at 899 ° C is required. The heat preservation time shall be maintained for one hour (at least half an hour / 25mm thickness) per 25mm thickness according to the material thickness, followed by air cooling.

ASME: SB-409, SB-408, SB-407 Code Case 1325. ASME: SB-409, SB-408, SB-407

Specifications

1. API 5L API 5CT Pipe
2. sch5s-schxxs
3. ISO9001,ISO9000
4. Market:America,Africa,Middle East,Southeast of Asia

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Introduction of carbon steel pipe
Hot-rolled carbon steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.
Cold-rolled (dial) carbon steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, and also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, and Rust thin-walled steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the outer diameter of cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be up to 0.25mm, the outer diameter of thin-walled pipe can be 5mm, and the wall thickness is less than 0.25mm. Cold rolling has higher dimensional accuracy than hot rolling.

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