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High-quenching-hardness martensitic stainless steel coil for measuring tool and preparation method thereof

A martensitic stainless steel, quenching hardness technology, used in temperature control, manufacturing tools, metal rolling and other directions, can solve the problem of the complete scrap steel smelting molten steel purity and mechanical properties of finished products are difficult to control stably, die casting billets are prone to shrinkage, Looseness, segregation, energy consumption and high production costs, to reduce the probability of material water ripple defects, avoid uneven deformation of finished products, and achieve good surface quality

Active Publication Date: 2021-07-27
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 5Cr13 stainless steel preparation method has complex production procedures, long production cycle, low production efficiency, high production costs such as energy consumption, low metal yield, and small batches; meanwhile, shrinkage cavities, looseness, and segregation are prone to occur in the die-cast billet. problems, and it is difficult to stably control indicators such as the purity of molten steel in all-scrap smelting and the mechanical properties of finished products

Method used

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  • High-quenching-hardness martensitic stainless steel coil for measuring tool and preparation method thereof
  • High-quenching-hardness martensitic stainless steel coil for measuring tool and preparation method thereof
  • High-quenching-hardness martensitic stainless steel coil for measuring tool and preparation method thereof

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Effect test

Embodiment 1

[0037] Embodiment 1: Take the preparation of a martensitic stainless steel strip for measuring tools with a width of 1250 mm and a thickness of 4.3 mm as an example.

[0038] ①Smelting: Smelting martensitic stainless steel with high-purity molten steel through the process of dephosphorizing converter pretreatment-AOD decarburization-LF refining for pure blast furnace molten iron; sampling for laboratory analysis and confirmation, the chemical elements in molten steel The mass percentages are: carbon 0.48%, silicon 0.45%, manganese 0.40%, phosphorus 0.018%, sulfur 0.001%, chromium 13.12%, nickel 0.14%, molybdenum ≤ 0.10%, vanadium ≤ 0.15%, nitrogen 0.0189%, the rest is iron and Unavoidable residual elements.

[0039] ②Continuous casting: The size of the casting slab is 220mm×1250mm×10500mm, the superheat of the tundish is controlled at 40°C, the temperature of the tundish is 1505°C, and a 220mm mold is used for casting.

[0040] ③ Grinding: The continuous casting slab in the a...

Embodiment 2

[0048] Embodiment 2: Take the preparation of a martensitic stainless steel strip for measuring tools with a width of 1250 mm and a thickness of 2.8 mm as an example.

[0049] ①Smelting: Smelting martensitic stainless steel with high-purity molten steel through the process of dephosphorizing converter pretreatment-AOD decarburization-LF refining for pure blast furnace molten iron; sampling for laboratory analysis and confirmation, the chemical elements in molten steel The mass percentage is: carbon 0.49%, silicon 0.52%, manganese 0.42%, phosphorus 0.021%, sulfur 0.0012%, chromium 13.08%, nickel 0.139%, molybdenum ≤ 0.10%, vanadium ≤ 0.15%, nitrogen 0.0218%, the rest is iron and Unavoidable residual elements.

[0050] ② Continuous casting: The size of the slab is 220mm×1250mm×10500mm, the superheat of the tundish is controlled at 38°C, the temperature of the tundish is 1503°C, and a 220mm mold is used for casting.

[0051] ③ Grinding: The continuous casting slab in the above st...

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Abstract

The invention discloses a high-quenching-hardness martensitic stainless steel coil for a measuring tool and a preparation method thereof. The high-quenching-hardness martensitic stainless steel coil is prepared from the following chemical components in percentage by weight: 0.43-0.53% of carbon, less than or equal to 1.0% of silicon, less than or equal to 1.0% of manganese, less than or equal to 0.040% of phosphorus, less than or equal to 0.005% of sulfur, 12.50-14.00% of chromium, less than or equal to 0.30% of nickel, less than or equal to 0.10% of molybdenum, less than or equal to 0.15% of vanadium, less than or equal to 1.0% of nitrogen and the balance iron and inevitable residual elements. The production process comprises the following steps of: (1) smelting; (2) continuous casting; (3) coping; (4) heating; (5) descaling; (6) rough rolling; (7) finish rolling; (8) coiling; (9) annealing; and (10) acid pickling. The HRC hardness of the stainless steel material prepared by the method can reach 57 degrees or above, and the stainless steel material has excellent indexes such as surface smoothness, wear resistance and toughness; and the provided preparation method is short in process flow, low in cost and high in yield.

Description

technical field [0001] The invention belongs to the technical field of steel processing for measuring tools, and in particular relates to a high quenching hardness martensitic stainless steel coil for measuring tools and a preparation method thereof. Background technique [0002] Steel for measuring tools has high requirements on hardness, wear resistance, corrosion resistance, mechanical properties, and dimensional stability. High hardness and high wear resistance can ensure that the measuring tool will not be worn out quickly and lose its precision during long-term use; good corrosion resistance can ensure that it will not be damaged for a long time in special environments such as atmosphere and hand sweat, and high dimensional stability. Guarantee that the gage maintains its shape and size during use and storage. In addition, the working surface of the measuring tool requires a high degree of smoothness. If the non-metallic inclusions and liquid carbides of the steel typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C33/04B22D11/18C21D8/02C21D1/32C21D6/00B21B37/74B21B45/00
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/001C22C33/04B22D11/002B22D11/18C21D8/0205C21D8/0226C21D8/0247C21D1/32C21D6/004C21D6/005C21D6/008B21B37/74B21B45/004C21D2211/008
Inventor 魏海霞潘吉祥徐斌李照国纪显彬
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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