Hastelloy stainless steel seamless steel pipe

Abstract

The invention discloses a hastelloy stainless steel seamless steel pipe comprising the following components in percentage by weight: 14.5-16.5% of chromium, 15-17% of molybdenum, 4-7% of iron, 3-4.5% of tungsten, less than or equal to 2.5% of cobalt, less than or equal to 0.01% of carbon, less than or equal to 1% of manganese, less than or equal to 0.08% of silicon, less than or equal to 0.35% of vanadium, less than or equal to 0.04% of phosphorus, less than or equal to 0.03% of sulfur and the balance of nickel; and the method for manufacturing the hastelloy stainless steel seamless steel pipe comprises the following steps of: (1) checking the material and performing primary acid washing on the material; (2) performing polishing, combined rolling and drawing and oil removal on the blank acid-washed previously; (3) determining whether the requirements of the finished product are met, and if not, performing solid-solution thermal treatment, straightening and acid washing on the intermediate and repeating the step 2; and (4) if so, performing solid-solution thermal treatment and straightening on the finished product, and then performing fixed-length cutting, acid washing and examination on the finished product. The hastelloy stainless steel seamless steel pipe has the functions of resisting corrosion, high temperature, strong acids and strong bases, and cost-saving.

Description

technical field [0001] The invention relates to the manufacture of a stainless steel seamless steel pipe, in particular to a Hastelloy stainless steel seamless steel pipe. Background technique [0002] Seamless steel pipe is a round, square, or rectangular steel with a hollow section and no seams around it. Seamless steel pipes are made of steel ingots or solid tube blanks that are perforated into capillary tubes, and then made by hot rolling, cold rolling or cold drawing. The seamless steel pipe has a hollow section and is widely used as a pipe for conveying fluid. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same. It is an economical cross-section steel and is widely used in the manufacture of structures. components and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, and steel scaffolding used in building construction. [0003] In some high temperature...

AI Technical Summary

Problems solved by technology

[0003] In some high temperature, inorganic and organic acids mixed with impurities (such as formic acid and acetic acid), seawater corrosion environment, etc., general stainless steel pipes cannot be widely used in this environment, and the maintenance cost is relatively high, so it cannot be widely promoted

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