Production method of 15CrMoR steel plates for equipment in hydrogen service

Abstract

The invention discloses a production method of 15CrMoR steel plates for equipment in hydrogen service. Steel is prepared from chemical components including, by weight, 0.10%-0.15% of C, 0.16%-0.25% ofSi, 0.42%-0.52% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.020%-0.050% of Alt, 0.90%-1.10% of Cr, 0.46%-0.56% of Mo, less than or equal to 0.010% of Sn, less thanor equal to 0.012% of As, less than or equal to 0.003% of Sb and the balance Fe and residual elements; and the tempering embrittlement coefficient X is equal to (10P+5Sb+4Sn+As)*10<-2> and is less than or equal to 15 ppm. The production technology process includes smelting in a converter, refinement in an LF, VD vacuum treatment, continuous casting, slab heating, controlled rolling, online coolingand heat treatment. Various actual product quality properties of the products produced with the method are as follows: head and tail samples of the steel plates are subjected to maximum simulated postweld heat treatment, the yield margin at the 1 / 2-plate-thickness positions of the samples ranges from 40 MPa to 100 MPa, the tensile margin ranges from 50 MPa to 80 MPa, and the low-temperature impact property is stable and large in margin.

Description

technical field [0001] The technical field of steelmaking of the present invention specifically relates to a production method of 15CrMoR steel plates for hydrogen equipment. Background technique [0002] Hydrogen steel is mainly used to manufacture pressure vessel equipment used in high temperature (temperature > 250°C) and high pressure (hydrogen partial pressure > 1.4MPa) hydrogen environment, and is widely used in petrochemical, coal chemical, electric power and other related industries, among which Most of them are used to manufacture hydrogenation units in oil refining and chemical industries, and a small part are used in the manufacture of separation, heat exchange equipment and pressure transmission pipeline equipment in hydrogen-facing environments. [0003] In addition to meeting the requirements of GB / T713-2014, the hydrogen 15CrMoR steel plate designed and used in China must also ensure that the mechanical properties of the simulated post-weld heat treatmen...

AI Technical Summary

Problems solved by technology

At the same time, the width of some steel plates for heads is large, which puts forward higher requirements for production equipment and production technology, and the production process control is difficult

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