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Method for producing core rod by utilizing 30Cr3MoV steel as raw material

A raw material and mandrel technology, which is applied in the field of mandrel production, can solve the problems of difficulty in guaranteeing lateral impact toughness and high production cost, and achieve the effects of improving cooling speed and hardening depth, fast cooling speed and dense crystalline structure.

Active Publication Date: 2014-02-05
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most commonly used mandrel material at home and abroad is H13 (4Cr5MoSiV1) steel, its production cost is too high, and the transverse impact toughness is not easy to guarantee

Method used

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  • Method for producing core rod by utilizing 30Cr3MoV steel as raw material
  • Method for producing core rod by utilizing 30Cr3MoV steel as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The mandrel steel type is 30Cr3MoV, which is made of material selection-refining-electroslag-forging-rough machining-heat treatment-finishing-chrome plating. After material selection, EAF+LF / VD refining method is adopted. Composed of the above steel scrap, return material, sponge iron, etc., tap after EAF oxidation, pre-deoxidize and partially alloy in the ladle, carry out LF / VD argon blowing refining, weakly stir before tapping, stirring time ≥ 15min, tap after calming Argon protection casting is used, and the electrode billet is hot-sent for electroslag remelting after demoulding. There is no slag groove larger than 3mm on the surface of the electroslag ingot. After demolding, it is hot-sent for forging. The composition is: C=0.28~0.33%, Si=0.55~0.70%, Mn=0.40~0.60%, Cr=3.00~3.30%, Mo=0.45~0.55%, V=0.20~0.30%, S≤0.008%, P≤0.012%; electroslag process control electroslag ingot chemical composition: C=0.28~0.33%, Si=0.45~0.65%, Mn=0.40~0.60%, Cr=3.00~3.30%, Mo=0.45~0.55%...

Embodiment 2

[0013] The mandrel steel type is 30Cr3MoV, which is made of material selection-refining-electroslag-forging-rough machining-heat treatment-finishing-chrome plating. After material selection, EAF+LF / VD refining method is adopted. Composed of the above steel scrap, return material, sponge iron, etc., tap after EAF oxidation, pre-deoxidize and partially alloy in the ladle, carry out LF / VD argon blowing refining, weakly stir before tapping, stirring time ≥ 12min, tap after calming Argon protection casting is used, and the electrode billet is hot-sent for electroslag remelting after demoulding. There is no slag groove larger than 3mm on the surface of the electroslag ingot. After demolding, it is hot-sent for forging. The composition is: C=0.28~0.33%, Si=0.55~0.70%, Mn=0.40~0.60%, Cr=3.00~3.30%, Mo=0.45~0.55%, V=0.20~0.30%, S≤0.008%, P≤0.012%; electroslag process control electroslag ingot chemical composition: C=0.28~0.33%, Si=0.45~0.65%, Mn=0.40~0.60%, Cr=3.00~3.30%, Mo=0.45~0.55%...

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Abstract

The invention belongs to the technical field of core rod production, and particularly relates to a method for producing a core rod by utilizing 30Cr3MoV steel as a raw material. The method for producing the core rod by utilizing the 30Cr3MoV steel as the raw material comprises the following steps of material selection, refining, electro slag, forging, rough machining, heat treatment and finish machining. The method disclosed by the invention can be used for refining by selecting the 30Cr3MoV steel as the raw material and adopting an EAF+LF / VD mode, enhances the purity and compacts the crystal structure, thereby obtaining higher impact toughness.

Description

technical field [0001] The invention belongs to the technical field of mandrel production, and in particular relates to a method for producing mandrels by using 30Cr3MoV steel as a raw material. Background technique [0002] The mandrel is the most important tool and mold necessary for the production of hot-rolled seamless steel pipes with modern technology, and its consumption cost accounts for about 50% of the maintenance cost of the rolling mill. The product is used in harsh environments during the rolling process of seamless steel pipes, and the operating temperature is 1150°C Around, the surface temperature can reach 600~800°C in a short period of time, and after use, spray water on the cooling platform to cool down, and quickly put it online again for recycling. During the rolling process, it bears multiple alternating cold and hot cycles and strong thermal wear, and also bears large and complex alternating loads. The main scrapping defects are surface cracks, wear, ri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06C22B9/18
Inventor 孟令贤周许徐宁高全德
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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