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Production method of valve steel 53Cr21Mn9Ni4N polishing bar

A production method and technology for polishing rods, applied in the field of iron and steel smelting, can solve the problems of dimensional tolerance, low yield of valve steel, low yield of finished products, etc., so as to reduce processing loss and energy consumption, improve dimensional accuracy control, and improve production. The effect of efficiency

Inactive Publication Date: 2017-01-04
JIANGSU SHENYUAN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quality requirements of 53Cr21Mn9Ni4N products are strict, and its production process is complicated. It adopts rolling or forging to open billets, heating and grinding loss is large, and cracking occurs frequently, resulting in low yield, especially cracks in thermal processing. Manufacturers have always been close Concerns and thorny issues, for small-sized valve steel, it is more difficult to control dimensional tolerance and dimensional accuracy
The above factors directly lead to the low yield of valve steel 53Cr21Mn9Ni4N, which affects the economic benefits of production enterprises

Method used

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  • Production method of valve steel 53Cr21Mn9Ni4N polishing bar
  • Production method of valve steel 53Cr21Mn9Ni4N polishing bar
  • Production method of valve steel 53Cr21Mn9Ni4N polishing bar

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Effect test

Embodiment 1

[0029] The wire rod specification for producing a furnace of 53Cr21Mn9Ni4N is φ6.7mm. Its production process is as follows: 25t electric furnace smelting→25tAOD smelting→25tLF refining→two-strand 150×150mm section billet continuous casting→heating→high-speed wire rolling→off-line heat treatment→straightening→polishing→qualified inspection→finished product into library. The specific production steps are as follows:

[0030] Step 1: Add scrap steel and high-carbon ferrochromium, ferronickel and other alloy materials into the electric arc furnace for primary melting. Tapping temperature is 1620°C, P: 0.030%;

[0031] The second step: AOD smelting, nitrogen blowing and oxygen smelting during the oxidation period. When the temperature reaches ≥1660°C and C≤0.60%, start to add ferrosilicon to reduce the operation, blow nitrogen for alloying, and adjust the alloy. When the composition meets the standard requirements, the steel is tapped when the temperature T≥1490°C, and then tran...

Embodiment 2

[0043] The wire rod specification for producing a furnace of 53Cr21Mn9Ni4N is φ6.5mm. Its production process is as follows: EBT electric furnace smelting→AOD smelting→LF refining→two-strand 150×150mm billet continuous casting→heating→high-speed wire rolling→on-line heat treatment→straightening→polishing→qualified inspection→finished product storage. The specific production steps are:

[0044] Step 1: Add scrap steel and high-carbon ferrochromium, ferronickel and other alloy materials into the electric arc furnace for primary melting. Tapping temperature is 1610°C, P: 0.036%;

[0045] The second step: AOD smelting, nitrogen blowing and oxygen smelting during the oxidation period. When the temperature reaches ≥1660°C and C≤0.60%, start to add ferrosilicon to reduce the operation, blow nitrogen for alloying, and adjust the alloy. When the composition meets the standard requirements and the temperature T≥1490℃, the steel is tapped and transferred to LF refining;

[0046] The th...

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Abstract

The invention provides a production method of a valve steel 53Cr21Mn9Ni4N polishing bar. The method comprises the steps of valve steel melting, continuous casting, high speed wire rolling, thermal treatment to obtain finished products. The method comprises the technological processes of electric furnace smelting, external refining, continuous casting, heating, high speed wire rolling, (offline / online type) thermal treatment, straightening, polishing, inspection and storage. The production method adopts the continuous casting mode, overcomes the defects that 53Cr21Mn9Ni4N high temperature plasticity is poor, deformation resistance is large, and continuous casting is hard, performs rolling directly through a continuous casting slab, greatly lowers material processing losses and energy consumption in links, and increases the yield of the slab; the continuous casting slab direct high speed wire precision rolling technology is adopted, the production efficiency is improved, the rolled finished wire rod size precision control is greatly improved, and 53Cr21Mn9Ni4N steel continuous casting slab direct rolling to steel wire rod one heating forming is achieved; online and offline types of thermal treatment are achieved, and free choosing can be performed according to client quality requirements.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for producing polished rods of valve steel 53Cr21Mn9Ni4N. Background technique [0002] Valve steel 53Cr21Mn9Ni4N is one of the austenitic valve steels in the national standard GB / T12773-2008, referred to as 21-4N, and contains the following components by weight percentage: C: 0.48~0.58%; Si: ≤0.35% ; Mn: 8.00~10.00%; P: ≤0.040%; S≤0.030%; Ni: 3.25~4.50%; 0.90%. [0003] 53Cr21Mn9Ni4N steel is an austenitic heat-resistant steel with carbide as the precipitation hardening phase. This steel has poor thermal conductivity, large thermal expansion coefficient, large deformation resistance, and worse plasticity than ordinary austenitic heat-resistant steel. It belongs to austenite aging. Steel is also often classified as difficult-to-deform steel, which is difficult to produce. Because of its high content of manganese, nickel, carbon, nitrogen and chromium, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B37/46B22D11/18C21D9/00
CPCB21B1/463B21B37/46B22D11/182C21D9/0075B21B1/18C21D6/002C21D8/1277C22C38/38C22C38/40B21C37/042
Inventor 张国付涂玉国翟德建柯洪升沈国平薛卫兵
Owner JIANGSU SHENYUAN SPECIAL STEEL
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