CN103397269A - Low-cost and high-strength wear-resistant cast steel and preparation method thereof - Google Patents

Abstract

The invention discloses a low-cost and high-strength wear-resistant cast steel, which is characterized by the comprising the following chemical components by weight: 0.10-0.16 part of carbon, 0.35-0.50 part of manganese, 0.75-0.90 part of silicon, no more than 0.040 part of phosphorus, no more than 0.040 part of sulfur, 1.35-1.65 parts of Cr, 0.15-0.25 part of nickel, 0.2-0.3 part of copper, 0.08-0.10 part of Ti, 0.04-0.06 part of Ta, 0.01-0.02 part of Hf, 0.04-0.06 part of Nb, 0.2-0.4 part of V, 0.05-0.07 part of Mo and a matrix of iron. The cast steel has ultra high mechanical properties: tensile strength of 1080MPa, yield strength of 873MPa, elongation of 14%, section shrinkage rate of 27%, impact absorbing energy of 56J, impact toughness of 66J / cm<2> and hardness of 291HB.

Description

Low-cost high-strength wearable cast steel and preparation method thereof

Technical field

The invention belongs to the steel casting technology, specifically a kind of cast steel and preparation method.

Background technology

Cast steel is the general name that does not experience the ferrous alloy for the production of foundry goods of eutectic transformation in process of setting.Cast steel is divided into casting carbon steel, cast low alloy steel and casting special steel 3 classes.For the higher machine parts of intensity, plasticity and toughness reguirements, all the mechanical mechanics property index such as lower, shock resistance is lower need to adopt steel casting, existing cast steel to have yield strength, tensile strength, can not meet the requirement of product to material mechanical performance.

Summary of the invention

The purpose of this invention is to provide a kind of low-cost high-strength wearable cast steel and preparation method thereof, have mechanical mechanics property preferably.

Technical scheme of the present invention is as follows:

A kind of low-cost high-strength wearable cast steel is characterized in that the chemical composition of described cast steel and mass percent thereof are:

Carbon 0.10-0.16, manganese 0.35-0.50, silicon 0.75-0.90, phosphorus≤0.040, sulphur≤0.040, chromium 1.35-1.65, nickel 0.15-0.25, copper 0.2-0.3, Ti0.08-0.10, Ta0.04-0.06, Hf0.01-0.02, Nb0.04-0.06, V0.2-0.4, Mo0.05-0.07, matrix is iron.

The preparation method of described low-cost high-strength wearable cast steel is characterized in that: each batching is put in industrial arc and carried out melting, add the refining agent refining, stir 10-15 minute, skim, and pour into foundry goods, teeming temperature is 1580-1630 ℃; Then carry out the subsequent heat treatment of foundry goods: first by room temperature, with 200-230 ℃ of/hour speed, be warming up to 865-875 ℃, insulation 3-4 hour; With 140-160 ℃ of/hour speed, be cooled to 620-630 ℃ again, insulation 30-60 minute; With 100-120 ℃ of/hour speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 150-170 ℃ of/hour speed, to be warming up to 720-740 ℃ again, insulation 2-3 hour, take out air cooling and get final product again;

Described refining agent mixes briquetting by following raw materials in part by weight and forms: barium carbonate 3-3.2, sodium tetraborate 2.3-2.6, sepiolite powder 5-6, sodium aluminum fluoride 1.3-1.5, alum 3-4, SnO ₂1.1-1.3, Bi ₂O ₃4.1-4.3, vanadium diboride 1.6-1.8, niobium carbide 2.3-2.5.

The mechanical property of superhigh strength cast steel of the present invention is: tensile strength 1080MPa, yield strength 873MPa, unit elongation 14%, relative reduction in area 27%, impact absorbing energy 56J, impelling strength 66J/cm2, hardness 291HB.

Embodiment

A kind of low-cost high-strength wearable cast steel, the chemical composition of described cast steel and mass percent thereof are:

Carbon 0.10-0.16, manganese 0.35-0.50, silicon 0.75-0.90, phosphorus≤0.040, sulphur≤0.040, chromium 1.35-1.65, nickel 0.15-0.25, copper 0.2-0.3, Ti0.08-0.10, Ta0.04-0.06, Hf0.01-0.02, Nb0.04-0.06, V0.2-0.4, Mo0.05-0.07, matrix is iron.

The preparation method, put into each batching in industrial arc and carry out melting, detects alloying constituent content and add corresponding composition up to standard, adds the refining agent refining, stirs 10-15 minute, skims, and pour into foundry goods, and teeming temperature is 1580-1630 ℃; Then carry out the subsequent heat treatment of foundry goods: first by room temperature, with 200-230 ℃ of/hour speed, be warming up to 865-875 ℃, insulation 3-4 hour; With 140-160 ℃ of/hour speed, be cooled to 620-630 ℃ again, insulation 30-60 minute; With 100-120 ℃ of/hour speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 150-170 ℃ of/hour speed, to be warming up to 720-740 ℃ again, insulation 2-3 hour, take out air cooling and get final product again;

Described refining agent is formed by following weight part (kilogram) raw material mixing briquetting: barium carbonate 3, sodium tetraborate 2.3, sepiolite powder 6, sodium aluminum fluoride 1.3, alum 3, SnO ₂1.1, Bi ₂O ₃4.1, vanadium diboride 1.6, niobium carbide 2.3.

The mechanical property of superhigh strength cast steel of the present invention is: tensile strength 1080MPa, yield strength 873MPa, unit elongation 14%, relative reduction in area 27%, impact absorbing energy 56J, impelling strength 66J/cm2, hardness 291HB.

Claims (2)

1. low-cost high-strength wearable cast steel is characterized in that the chemical composition of described cast steel and mass percent thereof are:

Carbon 0.10-0.16, manganese 0.35-0.50, silicon 0.75-0.90, phosphorus≤0.040, sulphur≤0.040, chromium 1.35-1.65, nickel 0.15-0.25, copper 0.2-0.3, Ti0.08-0.10, Ta0.04-0.06, Hf0.01-0.02, Nb0.04-0.06, V0.2-0.4, Mo0.05-0.07, matrix is iron.

2. the preparation method of low-cost high-strength wearable cast steel according to claim 1, is characterized in that: each batching is put in industrial arc and carried out melting, add the refining agent refining, stir 10-15 minute, skim, and pour into foundry goods, teeming temperature is 1580-1630 ℃; Then carry out the subsequent heat treatment of foundry goods: first by room temperature, with 200-230 ℃ of/hour speed, be warming up to 865-875 ℃, insulation 3-4 hour; With 140-160 ℃ of/hour speed, be cooled to 620-630 ℃ again, insulation 30-60 minute; With 100-120 ℃ of/hour speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 150-170 ℃ of/hour speed, to be warming up to 720-740 ℃ again, insulation 2-3 hour, take out air cooling and get final product again;

Described refining agent mixes briquetting by following raw materials in part by weight and forms: barium carbonate 3-3.2, sodium tetraborate 2.3-2.6, sepiolite powder 5-6, sodium aluminum fluoride 1.3-1.5, alum 3-4, SnO ₂1.1-1.3, Bi ₂O ₃4.1-4.3, vanadium diboride 1.6-1.8, niobium carbide 2.3-2.5.