A kind of production method of low-cost high hardenability medium carbon chromium steel

A technology with high hardenability and production method, applied in the direction of manufacturing converters, etc., can solve problems such as lack, achieve low P and low S control, improve density and composition segregation, and improve the effect of low temperature ductile-brittle transition temperature

Active Publication Date: 2018-05-15
山东寿光巨能特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently quenched and tempered crankshafts mainly include 40Cr and 42CrMo. These two products have different user groups, but there is a lack of a product that connects the two.

Method used

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  • A kind of production method of low-cost high hardenability medium carbon chromium steel
  • A kind of production method of low-cost high hardenability medium carbon chromium steel
  • A kind of production method of low-cost high hardenability medium carbon chromium steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for producing medium carbon chromium steel with low cost and high hardenability, comprising the steps of:

[0036] Primary smelting of basic converter with top-bottom combined blowing: 72t of high-quality molten iron is used as the main raw material, and 5t of pig iron is used as the main raw material for steelmaking. The hot charging ratio of molten iron reaches 80%. During the blowing process, lime, dolomite, Adding amount of ore, etc., using the "double slag" method for dephosphorization, controlling the C content wt to 0.08% in tapping, and the P content wt in tapping to 0.010%, blocking the slag and tapping; adding SiCaBaAl 1.0kg / t when tapping 15t, steel Core aluminum 2.0kg / t strong deoxidation, ferroalloy material (ferroalloy material includes ferrosilicon manganese, ferrochrome, nickel plate and ferromolybdenum), recarburizer, slag material (slag material adopts 300kg / furnace lime, 500kg / furnace pre-melting The mixture of refining slag and 100kg / furnace...

Embodiment 2

[0045] A method for producing medium carbon chromium steel with low cost and high hardenability, comprising the steps of:

[0046] Primary smelting of basic converter with top-bottom combined blowing: 72t of high-quality molten iron is used as the main raw material, and 5t of pig iron is used as the main raw material for steelmaking. The hot charging ratio of molten iron reaches 80%. During the blowing process, lime, dolomite, The amount of ore and other additions is dephosphorized by the "double slag" method. The content of C in tapping is controlled to 0.10% wt, the content of P in tapping is wt0.009%, and the slag is blocked to tapping; when tapping 15t, add SiCaBaAl1.0kg / t, steel Core aluminum 2.0kg / t strong deoxidation, ferroalloy material (ferroalloy material includes ferrosilicon manganese, ferrochrome, nickel plate and ferromolybdenum), recarburizer, slag material (slag material adopts 300kg / furnace lime, 500kg / furnace pre-melting The mixture of refining slag and 100kg...

Embodiment 3

[0055] A method for producing medium carbon chromium steel with low cost and high hardenability, comprising the steps of:

[0056] Primary smelting of basic converter with top-bottom combined blowing: 72t of high-quality molten iron is used as the main raw material, and 5t of pig iron is used as the main raw material for steelmaking. The hot charging ratio of molten iron reaches 80%. During the blowing process, lime, dolomite, The amount of ore and other additions is dephosphorized by the "double slag" method. The C content wt in tapping is 0.12%, the P content wt in tapping is 0.008%, and the slag is blocked for tapping; when tapping 18t, add SiCaBaAl 1.0kg / t, steel Core aluminum 2.0kg / t strong deoxidation, ferroalloy material (ferroalloy material includes ferrosilicon manganese, ferrochrome, nickel plate and ferromolybdenum), recarburizer, slag material (slag material adopts 300kg / furnace lime, 500kg / furnace pre-melting The mixture of refining slag and 100kg / furnace fluorite...

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Abstract

The invention discloses a method for producing low-cost high-hardenability medium carbon chromium steel. The method includes the following steps of top and bottom combined blowing basic converter primary smelting, LF finery refining, VD vacuum furnace degassing, continuous casting by a curved spray continuous casting machine, rolled steel heating, combined dephosphorization, rolling and stacking. By the adoption of the method, the design philosophy of fine adjustment Mo+V is adopted for improving the hardenability, a good tempered sorbite structure can be obtained, the high-end crankshaft steel quality requirement is met, a new approach is opened up, and the problems that the hardenability of 40Cr is insufficient and production cost of 42CrMoA is high are solved successfully.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a production method of low-cost high-hardenability medium-carbon chromium steel. Background technique [0002] The crankshaft is the most important component in the engine. It bears the force transmitted by the connecting rod and converts it into torque through the crankshaft output and drives other accessories on the engine to work. The crankshaft is subjected to the joint action of the centrifugal force of the rotating mass, the periodically changing gas inertial force and the reciprocating inertial force, so that the crankshaft is subjected to the bending torsional load. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the surface of the journal needs to be wear-resistant, work evenly, and have good balance. Currently quenched and tempered crankshafts mainly include 40Cr and 42CrMo. These two products have different user groups, but the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/06C22C33/04C21C5/35C21C7/064C21C7/06C21C7/10C21D8/06
CPCC21C5/35C21C7/06C21C7/064C21C7/10C21D8/065C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24
Inventor 张明荣刘发友朱卫东尚明刘勇王德龙桑培宇丁秀中张永安杨子江高文娟尹伟
Owner 山东寿光巨能特钢有限公司
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