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Double vacuum melting 630 stainless steel forging and its preparation method
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A stainless steel, double vacuum technology, applied in metal processing equipment and other directions, can solve the problems of uneven structure, product cracking, uneven material properties, etc., and achieve the effect of simple preparation method, high promotion value and excellent mechanical properties.
Active Publication Date: 2022-05-10
JIANGXI BAOSHUNCHANG SPECIAL ALLOY CO LTD
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Problems solved by technology
In the past manufacturing process, because most of this brand adopts the smelting path of intermediate frequency induction + AOD or intermediate frequency induction + electroslag remelting, the residual H content in the matrix is locally up to 8PPM, and hydrogen embrittlement caused by H accumulation in the subsequent service process Become a hidden danger of product cracking
In addition, due to the large 630 forgings, the structure is uneven due to composition segregation, and even too much residual ferrite is the reason for the uneven performance of the material.
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Embodiment 1
[0057] A double vacuum melting 630 stainless steel forging, the double vacuum melting 630 stainless steel forging includes the following raw materials in terms of mass fraction: C: 0-0.07%, Mn: 0-1.00%, P: 0-0.04%, S: 0- 0.03%, Si: 0-1.00%, Cr: 15.00-17.50%, Ni: 3.00-5.00%, Nb: 0.10-0.50%, Cu: 3.00-5.00%, N: 0.04-0.08%, Al: 0.01-0.07 %, the balance is iron and unavoidable impurities.
[0058] The preparation method of described double vacuum melting 630 stainless steel forgings is as follows:
[0059] S1: selected industrial pure iron, ferrosilicon, metallic chromium, ferro-niobium (above FeNb-50), electrolytic nickel, metallic Mn, electrolytic copper, ferrochrome nitride (N≥6%). According to the standard composition range of 630 in ASMESA-705, the raw materials are mixed according to the above ratio in order to optimize the performance and structure and consider the volatilization of Mn, Cu and N elements in the subsequent vacuum remelting;
[0060] S2: Load industrial pure...
Embodiment 2
[0082] A double vacuum melting 630 stainless steel forging, the double vacuum melting 630 stainless steel forging includes the following raw materials in terms of mass fraction: C: 0-0.07%, Mn: 0-1.00%, P: 0-0.04%, S: 0- 0.03%, Si: 0-1.00%, Cr: 15.00-17.50%, Ni: 3.00-5.00%, Nb: 0.10-0.50%, Cu: 3.00-5.00%, N: 0.04-0.08%, Al: 0.01-0.07 %, the balance is iron and unavoidable impurities.
[0083] The preparation method of the double vacuum melting 630 stainless steel forging is the same as that in Example 1.
Embodiment 3
[0085] A double vacuum melting 630 stainless steel forging, the double vacuum melting 630 stainless steel forging includes the following raw materials in terms of mass fraction: C: 0.05%, Mn: 0.70%, Si: 0.50%, Cr: 15.80%, Ni: 4.30%, Nb: 0.30%, Cu: 4.00%, N: 0.06%, Al: 0.02%, and the balance is iron and unavoidable impurities.
[0086] The preparation method of the double vacuum melting 630 stainless steel forging is the same as that in Example 1.
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Abstract
The invention provides a double vacuum melting 630 stainless steel forging. The double vacuum melting 630 stainless steel forging includes the following raw materials in terms of mass fraction: C: 0-0.07%, Mn: 0-1.00%, P: 0-0.04%, S: 0‑0.03%, Si: 0‑1.00%, Cr: 15.00‑17.50%, Ni: 3.00‑5.00%, Nb: 0.10‑0.50%, Cu: 3.00‑5.00%, N: 0.04‑0.08%, Al : 0.01‑0.07%, the balance is iron and unavoidable impurities. The invention also discloses a method for preparing the double vacuum melting 630 stainless steel forging. The double vacuum melting 630 stainless steel forging prepared by the invention has excellent mechanical properties, simple preparation process and high commercial value.
Description
technical field [0001] The invention relates to the field of special alloys, in particular to a double vacuum melting 630 stainless steel forging and a preparation method thereof. Background technique [0002] 630 (S17400) stainless steel is a precipitation hardening martensitic stainless steel containing copper and niobium. The principle of strengthening is that on the martensite matrix, 5 precipitates and dispersedly distribute carbides or intermetallic compounds containing Cu and Nb in combination with dislocations in the martensite matrix to achieve a comprehensive strengthening effect. After different aging temperatures, the highest strength can reach more than 1300MPa. In the past manufacturing process, because most of this brand adopts the smelting path of intermediate frequency induction + AOD or intermediate frequency induction + electroslag remelting, the residual H content in the matrix is locally up to 8PPM, and hydrogen embrittlement caused by H accumulation ...
Claims
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