CN103436798A

CN103436798A - Preparation method for drawing-die steel material

Info

Publication number: CN103436798A
Application number: CN201310290001XA
Authority: CN
Inventors: 鲍小曼
Original assignee: CHUZHOU XINLONG ELECTROMECHANICAL Co Ltd
Current assignee: CHUZHOU XINLONG ELECTROMECHANICAL Co Ltd
Priority date: 2013-07-11
Filing date: 2013-07-11
Publication date: 2013-12-11

Abstract

The invention provides a preparation method for a drawing-die steel material. The preparation method comprises the following steps: fusing; oxidation; detection of alloy components and adjustment; refining; casting; and heat treatment. The material is characterized by comprising the following chemical elements by weight: 0.6 to 0.7% of C, 4 to 4.5% of Cr, 1.2 to 1.3% of Mn, 0.5 to 0.6% of Si, 0.3 to 0.4% of Mo, 0.8 to 0.9% of Ni, 0.01 to 0.004% of S, 0.01 to 0.02% of P, 0.2 to 0.3% of Cu, 2.1 to 2.3% of Be, 0.03 to 0.05% of La, 0.1 to 0.14% of Sc and 0.05 to 0.08% of Tb, with the balance being Fe. According to the invention, molybdenum, nickel and copper in the die steel have good corrosion resistance to oxidizing acid, most organic acids and aqueous solutions of organic salts; through addition of alloys like molybdenum and copper, the die steel maintains sufficient strength and hardness at a high temperature and has good processability and weldability and a greatly prolonged service life on a machine.

Description

A kind of preparation method of wire-drawing die steel

Technical field

The present invention relates to a kind of moulding stock, specifically a kind of preparation method of wire-drawing die steel.

Background technology

Mould the operation such as beats for stamping-out, stretching, bending, extruding, the upsetting of metal or non-metallic material.Die steel requires to have enough intensity, toughness, hardness, fastness to wear, anti-fatigue ability, resistance to deformation, anti-fracture energy.At present, the die steel material be most widely used on moulding stock market is high carbon and chromium die steel, and its intensity, hardness are generally easy to be met, but toughness is lower, can not meet the mechanical workout needs.

Summary of the invention

The preparation method who the purpose of this invention is to provide a kind of wire-drawing die steel.

The present invention is achieved by the following technical solutions.

A kind of preparation method of wire-drawing die steel, comprise fusing, oxidation, detection alloying constituent adjustment, refining, casting, thermal treatment, it is characterized in that: the per-cent of its chemical element weight is: carbon 0.6-0.7, chromium 4-4.5, manganese 1.2-1.3, silicon 0.5-0.6, molybdenum 0.3-0.4, nickel 0.8-0.9, sulphur 0.01-0.004, phosphorus 0.01-0.02, copper 02-0.3, Be2.1-2.3, La0.03-0.05, Sc0.1-0.14, Tb0.05-0.08, surplus are iron;

Described thermal treatment refers to: foundry goods is warming up to 320-345 ℃ with 110-130 ℃/h of speed, insulation 4-6 hour; Then, then be warming up to 510-535 ℃ with 95-115 ℃/h of speed, insulation 7-8 hour; Be warming up to 940-980 ℃ with 70-90 ℃/h of speed again, insulation 2-3 hour; Be warming up to 1100-1140 ℃ with 80-100 ℃/h of speed again, insulation 1-2 hour; Be cooled to 600-640 ℃ with 50-60 ℃/h of speed again, insulation 3-4 hour; Be cooled to 200-240 ℃ with 150-160 ℃/h of speed again, be incubated after 3-4 hour, then put into liquid nitrogen and process 2-3 hour.

In die steel of the present invention, molybdenum, nickel, copper have good solidity to corrosion to the aqueous solution of oxidizing acid, most of organic acid and organic salt, add the alloys such as molybdenum, copper, at high temperature can keep enough intensity and hardness, there is good processing characteristics and weldability, greatly improved and used on the machine the life-span.

Embodiment

A kind of preparation method of wire-drawing die steel, comprise fusing, oxidation, detection alloying constituent adjustment, refining, casting, thermal treatment, the per-cent of its chemical element weight is: carbon 0.6-0.7, chromium 4-4.5, manganese 1.2-1.3, silicon 0.5-0.6, molybdenum 0.3-0.4, nickel 0.8-0.9, sulphur 0.01-0.004, phosphorus 0.01-0.02, copper 02-0.3, Be2.1-2.3, La0.03-0.05, Sc0.1-0.14, Tb0.05-0.08, surplus are iron;

Thermal treatment refers to: foundry goods is warming up to 320-345 ℃ with 110-130 ℃/h of speed, insulation 4-6 hour; Then, then be warming up to 510-535 ℃ with 95-115 ℃/h of speed, insulation 7-8 hour; Be warming up to 940-980 ℃ with 70-90 ℃/h of speed again, insulation 2-3 hour; Be warming up to 1100-1140 ℃ with 80-100 ℃/h of speed again, insulation 1-2 hour; Be cooled to 600-640 ℃ with 50-60 ℃/h of speed again, insulation 3-4 hour; Be cooled to 200-240 ℃ with 150-160 ℃/h of speed again, be incubated after 3-4 hour, then put into liquid nitrogen and process 2-3 hour.

Adopt following refining agent during described refining, made by the raw material of following weight part (kilogram):

Pearlstone 1.2, rice husk ash 1.3, vermiculite power 6, sodium aluminum fluoride 2.3, kaolin 2.5, alum 2.Above-mentioned material is added to deionized water and grind slurrying in 2-3 hour and cross the 300-500 mesh sieve, spraying drying, at 230-250 ℃ of lower roasting 2-3 hour and get final product.

Deoxidation of the present invention, desulfurization, dephosphorization rate, between 60-75%, are removed the inclusion in molten steel and make the internal soundness that inclusion modification is effective, cleaning molten steel has improved steel, and the degree of porosity in foundry goods reduces the 1-2 degree, is controlled effectively.

The die steel that aforesaid method makes, its tensile strength surpasses 1950MPa, and impelling strength surpasses 94J/cm2, and fracture toughness property is greater than 75MPa.m1/2; Heat treatment hardness value (HRC) 657.5, have excellent wear resistance.

Claims

1. the preparation method of a wire-drawing die steel, comprise fusing, oxidation, detection alloying constituent adjustment, refining, casting, thermal treatment, it is characterized in that: the per-cent of its chemical element weight is: carbon 0.6-0.7, chromium 4-4.5, manganese 1.2-1.3, silicon 0.5-0.6, molybdenum 0.3-0.4, nickel 0.8-0.9, sulphur 0.01-0.004, phosphorus 0.01-0.02, copper 02-0.3, Be2.1-2.3, La0.03-0.05, Sc0.1-0.14, Tb0.05-0.08, surplus are iron.

2. the preparation method of wire-drawing die steel according to claim 1, it is characterized in that described thermal treatment refers to: foundry goods is warming up to 320-345 ℃ with 110-130 ℃/h of speed, insulation 4-6 hour; Then, then be warming up to 510-535 ℃ with 95-115 ℃/h of speed, insulation 7-8 hour; Be warming up to 940-980 ℃ with 70-90 ℃/h of speed again, insulation 2-3 hour; Be warming up to 1100-1140 ℃ with 80-100 ℃/h of speed again, insulation 1-2 hour; Be cooled to 600-640 ℃ with 50-60 ℃/h of speed again, insulation 3-4 hour; Be cooled to 200-240 ℃ with 150-160 ℃/h of speed again, be incubated after 3-4 hour, then put into liquid nitrogen and process 2-3 hour.