Seamless steel pipe thickening mould material with long service life and heat treatment technology thereof

A seamless steel pipe and mold technology, applied in the field of long-life seamless steel pipe thickening mold material and heat treatment process, can solve the problem of not being suitable for high-alloy, high-strength seamless steel thickening molds, increasing time and cost, and heat treatment Process complexity and other issues

Active Publication Date: 2017-06-13
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These patents use different methods to meet the needs of their working conditions by improving a certain aspect. However, some design heat treatment processes are too complicated, which increases time and cost; but these methods are not suitable for high rolling. Working conditions and requirements of alloy and high-strength seamless steel thickening dies

Method used

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  • Seamless steel pipe thickening mould material with long service life and heat treatment technology thereof
  • Seamless steel pipe thickening mould material with long service life and heat treatment technology thereof
  • Seamless steel pipe thickening mould material with long service life and heat treatment technology thereof

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Embodiment 7

[0086] According to the range of chemical composition designed by the present invention, the intermediate frequency furnace is used to refine the electroslag rod, and the composition is strictly controlled to reduce the harmful alloy elements of the steel ingot; the smelting adopts two electroslag remelting, and the spheroidization is carried out after each remelting Annealing, that is, annealing after intermediate frequency smelting, primary electroslag remelting, spheroidizing annealing, secondary electroslag remelting, and spheroidizing annealing, greatly improves the quality of steel, reduces and eliminates defects such as micro-bubbles, inclusions, and micro-cracks; Carry out forging afterwards, forging ratio>5, quenching and tempering heat treatment and final heat treatment process designed by the present invention. Afterwards, the material was made into a seamless steel pipe thickening die, and different steel types were tested and rolled, and the service life is shown i...

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Abstract

The invention relates to a seamless steel pipe thickening mould material with long service life and a heat treatment technology thereof. The seamless steel pipe thickening mould material comprises the following chemical ingredients in percentage by weight: 0.4-0.6% of C, 0.8-1.2% of Si, 0.6-1.2% of Mn, 2.5-3.5% of Cr, 1.8-3.5% of Mo, 1.2-3.0% of V, 0.8-2.0% of W, 0.35-0.6% of Nb and balance of Fe and inevitable impurities; the following relation formulas need to be met: C=0.03Mn+0.015Cr+0.16V+0.2Nb, and (V+Mo+W / 2)=3.4-5.7wt.%. The seamless steel pipe thickening mould material has the advantages that on the basis of a 4Cr5MoSiV1 material, by comprehensively adjusting composition proportion and designing a reasonable heat treatment technology, a thickening mould meeting mechanical property requirements such as resistance to heat crack is developed, so that abnormal fracture failure of the thickening mould is avoided, and service life of the thickening mould is prolonged.

Description

technical field [0001] The invention relates to mold technology, in particular to a long service life seamless steel pipe thickening mold material and heat treatment process. Background technique [0002] Hot work die steel H13 is a medium-carbon medium-alloy die steel of the American brand. The composition of the die steel of the 4Cr5MoSiV1 brand in my country is equivalent to that of H13, and is often used as a localized alternative material for H13. [0003] At present, the seamless steel pipe thickening die adopts the material of 4Cr5MoSiV1 grade; the thickening die of this material can meet the rolling requirements when rolling low-alloy seamless steel. [0004] However, in recent years, the demand for seamless steel pipe products has reflected the trend of more, more personalized, and faster and faster demand updates. In addition to ordinary seamless pipes such as rolled oil well pipes, boiler pipes, line pipes, and structural pipes, 13Cr, The number of high-alloy con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C21D1/18C21D6/00
CPCC21D1/18C21D6/002C21D6/005C21D6/008C21D2211/002C21D2211/008C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26
Inventor 瞿海霞王超峰朱翔宇顾廷权吴琼姚利松
Owner BAOSHAN IRON & STEEL CO LTD
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