Softening treatment of moderate alloy nickle serial cold working mold steel

Abstract

The invention was involved in anneal and softening of die steel. When forging machine did hot work treatment to converted timber, forging temperature was 870deg.C to get austenite. Forged steel was cooled by radiation to room temperature and then laid aside for 2-4h so that the original austenite was changed into the mixture of upper bainite and low bainite. Forged steel was heated to 670deg.C with 90deg.C per hour and held 30h, and then the mixture was changed into sorbite.Forged steel was out from heating-furnace and cooled to room temperature. The die steel in this invention contained 4% Ni-Cr forged steel and shortened 50% process time. Hardness was lower than HB270. The technique is simple, easy to process and the cost is low. The softening time is short with high efficiency. And the characteristics of steel were improved and it meets requirements of customer and marketing. So the economic performance was improved obviously.

Description

technical field

[0001] The invention relates to a softening treatment method for die steel in the metallurgical industry, in particular to a softening treatment method for cold-working die steel. Background technique

[0002] Die steel is a special alloy steel, which can be divided into hot work die steel, cold work die steel and plastic die steel according to its application. Medium-alloy nickel-based cold work die steel (the content range of the main chemical components is: carbon 0.40%-0.55%; nickel 3.50%-4.50%; chromium 1.10%-1.70%; molybdenum 0.10%-0.50%; silicon 0.10%-0.50% %; Phosphorus ≤ 0.030%; Sulfur ≤ 0.030%) is a material with good performance in cold work die steel, which has good strength, toughness, pattern etching performance and excellent cutting machinability, and is often used as Stainless steel cold forming mold materials (such as stainless steel utensils such as stainless steel tableware and precision stainless steel parts).

[0003] In order to meet t...

Examples

Embodiment Construction

[0012] specific implementation plan

[0013] A certain iron and steel company implements the patent of the invention, and softens the forging material of medium-alloy nickel-based cold work die steel, and uses 4% Ni-Cr forging material (the chemical composition of the die steel is: carbon 0.40%-0.50%; silicon 0.10% -0.40%; manganese 0.15%-0.45%; chromium 1.20%-1.50%; molybdenum 0.15%-0.35%; nickel 3.80%-4.30%; phosphorus ≤ 0.030%; When hot-working finished products, the final forging temperature is controlled at 870-890°C; secondly, the forged hot-processed die steel forgings are naturally cooled to room temperature in the air, and placed for 3-4 hours; thirdly, the forgings are moved into In the heating furnace, heat at a heating rate of 90°C / h to a temperature of 660-680°C for 30 hours; fourth, remove the material from the furnace and air-cool to room temperature. For the softened 4% Ni-Cr forging material, the time is shortened by 50%, and the physical hardness test (see T...

technical field

[0001] The invention relates to a softening treatment method for die steel in the metallurgical industry, in particular to a softening treatment method for cold-working die steel. Background technique

[0002] Die steel is a special alloy steel, which can be divided into hot work die steel, cold work die steel and plastic die steel according to its application. Medium-alloy nickel-based cold work die steel (the content range of the main chemical components is: carbon 0.40%-0.55%; nickel 3.50%-4.50%; chromium 1.10%-1.70%; molybdenum 0.10%-0.50%; silicon 0.10%-0.50% %; Phosphorus ≤ 0.030%; Sulfur ≤ 0.030%) is a material with good performance in cold work die steel, which has good strength, toughness, pattern etching performance and excellent cutting machinability, and is often used as Stainless steel cold forming mold materials (such as stainless steel utensils such as stainless steel tableware and precision stainless steel parts).

[0003] In order to meet t...

Examples

Embodiment Construction

[0012] specific implementation plan

[0013] A certain iron and steel company implements the patent of the invention, and softens the forging material of medium-alloy nickel-based cold work die steel, and uses 4% Ni-Cr forging material (the chemical composition of the die steel is: carbon 0.40%-0.50%; silicon 0.10% -0.40%; manganese 0.15%-0.45%; chromium 1.20%-1.50%; molybdenum 0.15%-0.35%; nickel 3.80%-4.30%; phosphorus ≤ 0.030%; When hot-working finished products, the final forging temperature is controlled at 870-890°C; secondly, the forged hot-processed die steel forgings are naturally cooled to room temperature in the air, and placed for 3-4 hours; thirdly, the forgings are moved into In the heating furnace, heat at a heating rate of 90°C / h to a temperature of 660-680°C for 30 hours; fourth, remove the material from the furnace and air-cool to room temperature. For the softened 4% Ni-Cr forging material, the time is shortened by 50%, and the physical hardness test (see T...