CN1340632A

CN1340632A - Stainless die steel for plastics

Info

Publication number: CN1340632A
Application number: CN 00115973
Authority: CN
Inventors: 杨凡; 刘汉洲; 李文禄; 张卫国; 朱魁发
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-08-25
Filing date: 2000-08-25
Publication date: 2002-03-20
Anticipated expiration: 2020-08-25
Also published as: CN1108394C

Abstract

A stainless steel suitable for plastic mould contains C (0.26-0.40 wt.%), Si (0-1), Mn (0-1), P (0-0.04), S (0-0.02), Cr (13-20), Ni (0.2-2), Mo (0.5-1.5), and Fe (the rest). Its advantages include high antiwear and anticorrosion performance, not cracking in heat treatment, and high size stability.

Description

Stainless die steel for plastics

The present invention relates to metallurgical industry, belong to the die steel class.

Develop rapidly along with plastic industry, demand to plastic die steel is increasing, in order to produce high-quality plastics, high-quality plastic die steel must be arranged, people constantly study new high-quality plastic die steel for this reason, as the die steel of announcing on February 25th, 98 that the manufacturing injection-moulded plastic is used that is mainly used in, application number is 97109968 invention, it has preferable performance than general plastic die steel, but there are the following problems for it: 1. carbon content is on the low side, thereby its wear resistance will be relatively poor; 2. according to practice and theoretical proof, be lower than 12% when steel contains the Cr amount, then its erosion resistance must be low, and it is improper that the content range of its Cr is selected; 3. its ni content height, then its residual austenite must be too high, thereby cause its hardness and strength degradation.

The objective of the invention is to provide a kind of high-wearing feature, high corrosion resistance, high strength to make the stable stainless die steel for plastics of die size for making high-quality plastics.

For achieving the above object, chemical ingredients of the present invention is by following conceptual design (weight %): C 0.26-0.40, Si 0-1.00, Mn 0-1.00, P 0-0.040, S 0-0.020, Cr 13.0-20.0, Ni 0.2-2.0, Mo 0.50-1.50, surplus is Fe and trace impurity.

The superior performance of this steel grade design is:

1. low carbon content in can guarantee to form tiny and dispersing carbide, to reach very high wear resistance, can guarantee the erosion resistance of steel simultaneously again;

2. high chrome content in can guarantee to have good solidity to corrosion, combines with carbon to form dispersing carbide, thereby makes steel have good wear resistance;

3. contain certain nickel, can improve the hardening capacity of steel, make the mould of large-size that uniform hardness all be arranged from the edge to the center; Add the toughness that nickel has also improved steel, make mould be difficult for cracking; Die size is stable;

4. add an amount of molybdenum, have three kinds of effects, that is: a. has improved the corrosion resistance of steel greatly; B. improved the wear resistance of steel; C. improved the anti-temper resistance of steel, guaranteed steel die after thermal treatment, be difficult for cracking, and dimensional stabilizing.

Facts have proved that the present invention has the wear resistance height, erosion resistance (especially anti-pitting attack) height in the middle of thermal treatment and using, is difficult for cracking, and is used as mould, and dimensional stabilizing is particularly suitable for making mould of plastics.

The invention will be further described below in conjunction with embodiment:

Embodiment 1: by the 630kg ingot chemical ingredients of weighing be: C 1.64kg, and Mn 4.28kg, Si 4.73kg, Cr 101.62kg, Ni 4.03kg, Mo 6.30kg, S 0.032kg, P 0.032kg, all the other are Fe and inevitable trace impurity.Adopt induction furnace to smelt ingot, become a useful person and make anneal (2 hours stoves of 760-800 ℃ of insulation are cold, HB≤230) warehouse-in through hammer cogging again.

Embodiment 2: by the 630kg ingot chemical ingredients of weighing be: C 1.89kg, and Mn 4.79kg, Si 3.97kg, Cr 100.17kg, Ni 5.99kg, Mo 6.05kg, S 0.038kg, P 0.13kg, all the other are Fe and inevitable trace impurity.Adopt electric arc furnace smelting to go out ingot, become a useful person (1150-1250 ℃ of ingot Heating temperature, 1100-1200 ℃ of base Heating temperature) and do annealing warehouse-in through hammer cogging again.

Embodiment 3: by the 630kg ingot chemical ingredients of weighing be: C 2.27kg, and Mn 4.66kg, Si 3.65kg, Cr 101.12kg, Ni 5.99kg, Mo 6.11kg, S 0.032kg, P 0.11kg, all the other are Fe and inevitable trace impurity.Adopt electric arc furnace smelting to go out ingot, become a useful person and does annealing and put in storage through hammer cogging again.

This plastic die steel is on probation through the user, has obtained excellent result, its wear resistance, erosion resistance, hardness, intensity are all very good, with the plastics dimensional stabilizing of its production, visual appearance is beautiful, has been subjected to user's high evaluation, has wide promotion prospect.

Claims

1. stainless die steel for plastics is characterized in that: its chemical ingredients is (weight %): C 0.26-0.40, Si 0-1.00, Mn 0-1.00, P 0-0.040, S 0-0.020, Cr 13.0-20.0, Ni 0.2-2.0, Mo 0.50-1.50, surplus is Fe and trace impurity.