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Ultrahigh-strength stainless steel with good plasticity and ductility and manufacturing method thereof

A technology of ultra-high strength and manufacturing method, applied in the field of stainless steel and its manufacturing, can solve the problems of low stainless steel content and low strength, etc.

Active Publication Date: 2012-07-25
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The stainless steel adopts optimized composition design, and adopts enhanced double vacuum smelting process and large forging ratio forging forming technology, so that the strength of the stainless steel can reach Rm≥1800MPa, elongation A≥11%, and fracture toughness K1c reaches However, the content of C and Co in this stainless steel is low, so the strength is slightly lower

Method used

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  • Ultrahigh-strength stainless steel with good plasticity and ductility and manufacturing method thereof
  • Ultrahigh-strength stainless steel with good plasticity and ductility and manufacturing method thereof
  • Ultrahigh-strength stainless steel with good plasticity and ductility and manufacturing method thereof

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Embodiment 1-7

[0056] The specific steps of manufacturing the ultra-high-strength stainless steel with good plasticity and toughness described in the present invention are as follows (see Table 2 for the chemical composition of each steel grade in Examples 1-7 of this case):

[0057] (1) Vacuum induction furnace melting:

[0058] a) First add 0.28-0.32wt% C, then put the remaining elements except Cr into the crucible, preheat the crucible to 400-600°C, and evacuate to ≤2.7Pa;

[0059] b) When preheating to 400-600°C and vacuum degree ≤ 2.7Pa, melt at a melting speed of 5-10kg / min;

[0060] c) After complete melting, refining is carried out at a temperature of 1560-1600°C, and the holding time is 60-90 minutes;

[0061] d) adding Cr and melting at a melting speed of 5-10kg / min;

[0062] e) After Cr is fully melted, refining is carried out again at a temperature of 1560-1600 °C, and the refining time is controlled at 20-30 minutes;

[0063] (2) Pouring electrodes;

[0064] (3) Vacuum consu...

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Abstract

The invention discloses ultrahigh-strength stainless steel with good plasticity and ductility and a manufacturing method of the stainless steel. The stainless steel comprises the following chemical compositions by weight percentage: 0.16-0.32wt% of C, less than or equal to 0.1wt% of Si, less than or equal to 0.1wt% of Mn, 10.0-15.0wt% of Cr, 6.0-8.0wt% of Ni, 13.0-16.0wt% of Co, 1.0-3.0wt% of Mo, 0.9-1.1wt% of W, 0.2-0.5wt% of V, 0.08-0.15wt% of Nb, less than or equal to 0.002wt% of N, less than or equal to 0.0015wt% of O, and the balance of Fe and other inevitable impurities. Moreover, the invention also provides the manufacturing method of the ultrahigh-strength stainless steel with good plasticity and ductility, which comprises dual vacuum melting, large forging ratio forming technique special thermal treatment technique, so that the steel has good strength and ductility further.

Description

technical field [0001] The invention relates to a stainless steel and a manufacturing method thereof, in particular to an ultra-high-strength stainless steel and a manufacturing method thereof. Background technique [0002] High-strength stainless steel is widely used in aerospace, medical equipment, oil drilling equipment, light weapons and marine applications due to its combination of high strength and good corrosion resistance. However, in recent years, with the continuous improvement of the performance requirements for some important structural parts of aerospace, the requirements for the strength and toughness of high-strength stainless steel have also increased. At present, there are few practical stainless steels with ultra-high strength and high toughness matching. The most representative high-strength stainless steels used in China are 17-4PH, 15-5PH and PH13-8Mo. Although they have high corrosion resistance, their strength or toughness is low. Therefore, it has s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/52C22C33/04C21D8/00
Inventor 田玉新张景海郭军霞赵肃武
Owner 宝武特种冶金有限公司
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