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1150MPa-grade high-strength free-cutting stainless steel and preparation method thereof

A 1.1150mpa, high-strength technology, applied in the field of metallurgy, can solve the problems of low strength and poor cutting performance of easy-cut stainless steel, and achieve the effects of improving plastic toughness, good mechanical properties, and avoiding cracks and hot embrittlement

Inactive Publication Date: 2021-07-06
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the existing free-cutting stainless steel has poor cutting performance and low strength.

Method used

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  • 1150MPa-grade high-strength free-cutting stainless steel and preparation method thereof
  • 1150MPa-grade high-strength free-cutting stainless steel and preparation method thereof
  • 1150MPa-grade high-strength free-cutting stainless steel and preparation method thereof

Examples

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Effect test

preparation example Construction

[0051] The preparation method of the above-mentioned 1150MPa grade high-strength free-cutting stainless steel comprises the following steps:

[0052] a. Ingredients: high-purity iron, high-sulfur pig iron, electrolytic manganese, nickel plate, ferrosilicon, ferrochrome, ferrotitanium, rare earth cerium, and recarburizer are used as raw materials, and ingredients are made according to the chemical composition of 1150MPa high-strength free-cutting stainless steel;

[0053] b. Vacuum furnace smelting: Add high-purity iron and nickel plates into the vacuum induction melting furnace, and then evacuate the furnace and then send electricity to melt. After the high-purity iron and nickel plates are completely melted, pour argon gas into it, and add high-sulfur pig iron, electrolytic manganese, Ferrosilicon alloy, ferrochrome and recarburizer, when the alloy is completely melted, the temperature is raised and refined. After refining, rare earth cerium and ferrotitanium are added to the ...

Embodiment

[0061] This example provides two groups of 1150MPa-grade high-strength free-cutting stainless steel prepared by the preparation method of the present invention, such as Examples 1 and 2, and the composition design of the 1150MPa-grade high-strength free-cutting stainless steel in Example 1 and Example 2 is shown in Table 1.

[0062] Table 1 embodiment free-cutting stainless steel composition design (wt %)

[0063] element C Cr mn Si Ni S O Ce Ti P Example 1 0.13 13.5 1.1 0.32 0.12 0.30 0.01 0.008 0.006 0.008 Example 2 0.12 13.3 1.2 0.30 0.10 0.32 0.01 0.010 0.006 0.005

example 1 and 2

[0064] The preparation of the 1150MPa grade high-strength free-cutting stainless steel of example 1 and 2 comprises the steps:

[0065] a. Ingredients: Using high-purity iron, high-sulfur pig iron, electrolytic manganese, nickel plate, ferrosilicon, ferrochrome, ferrotitanium, rare earth cerium, and recarburizer as raw materials, calculate the mass of each material according to the mass percentage of the design components in Examples 1 and 2 , the material of the alloy raw material is shown in Table 2; high-purity iron is weighed by 100Kg electronic scale, high-sulfur pig iron, ferrochrome, nickel plate, rare earth cerium, ferro-titanium, recarburizer, etc., are weighed by 200g electronic scale, each Grind with emery wheel before charge weighing, remove its surface scale and do drying process, every furnace batches 120Kg altogether, and the consumption of each raw material of example 1 and 2 is as shown in table 3.

[0066] Table 2 alloy raw materials (wt%)

[0067] ...

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Abstract

The invention discloses 1150MPa-grade high-strength free-cutting stainless steel and a preparation method thereof, and belongs to the technical field of metallurgy. Chemical components of the 1150MPa-grade high-strength free-cutting stainless steel comprise, by mass percent, 0.10%-0.15% of C, 0.20%-0.40% of Si, 1.0%-1.5% of Mn, 0.10%-0.15% of Ni, 12.0%-15.0% of Cr, 0.1%-0.5% of S, 0.005%-0.020% of Ce, 0.001%-0.030% of Ti, 0.005%-0.030% of O, not larger than 0.01% of P and the balance Fe and inevitable impurities. The preparation method of the 1150MPa-grade high-strength free-cutting stainless steel comprises the steps of burdening, smelting in a vacuum furnace, pouring, forging and the like. By reasonably adding the Ce and Ti elements and cooperating with a reasonable forging process, the steel not only has good cutting performance, but also has very good mechanical properties, the tensile strength of the forged free-cutting stainless steel is larger than or equal to 1150 MPa, the yield strength is larger than or equal to 900 MPa, the percentage reduction of area is larger than or equal to 25%, the percentage elongation after fracture is larger than or equal to 10%, the impact toughness is larger than or equal to 25 J, and the problems that existing free-cutting stainless steel is poor in cutting performance and low in strength are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 1150MPa high-strength free-cutting stainless steel and a preparation method thereof. Background technique [0002] Sulfur in sulfur-based free-cutting steel mainly exists in the form of manganese sulfide. Manganese sulfide inclusions can be used as stress concentration sources to induce many micro-cracks in the matrix, reduce cutting resistance and cause steel to break easily during turning. Sulfur-containing easy-cutting The size, shape and distribution of manganese sulfide in steel have a significant impact on the mechanical properties of steel. Free-cutting steel is easy to generate long and thin strips of manganese sulfide after forging deformation, which causes anisotropy of the steel and reduces the comprehensive mechanical properties of the steel. The elongated strips of manganese sulfide with an aspect ratio exceeding 4:1 not only destroy the continuity ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/50C22C38/60B21J5/00C22C33/06
CPCB21J5/002C22C33/06C22C38/005C22C38/02C22C38/04C22C38/50C22C38/60
Inventor 王英虎郑淮北宋令玺柏川
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD