CN104131242B - A kind of low-carbon and low-alloy Steel material and manufacture method thereof - Google Patents

Abstract

The invention discloses a kind of low-carbon and low-alloy Steel material and manufacture method thereof, chemical element composition and mass percent thereof that it contains be: carbon 0.23-0.35%, silicon 0.2-0.5%, manganese 0.08-0.085%, cobalt 0.03-0.04%, copper 0.25-0.3%, molybdenum 0.35-0.4%, cerium 0.003-0.004%, boron 0.05-0.06%, titanium 0.02-0.04%, aluminum 0.8-0.9%, sulfur 0.07-0.075%, phosphorus 0.06-0.08%, surplus are ferrum；The present invention ensures the steel alloy requirement to anti-impact force and toughness by adopting low-carbon (LC) and low alloying composition, the Steel material hardness of the present invention is high, content by adding with control silicon, manganese, cobalt, molybdenum, cerium and titanium simultaneously, improve its toughness, it is to avoid producing and the generation of brittle failure situation when working of crackle；The raw material of the present invention is simple, and cost is low.

Description

A kind of low-carbon and low-alloy Steel material and manufacture method thereof

Technical field

The present invention relates to a kind of steel alloy and manufacture method thereof, particularly to the manufacture method of a kind of low-carbon and low-alloy Steel material.

Background technology

In the industry such as mining, metallurgy, cement, pottery, the equipment frequently contacting hard Ore or other hard things can be worn, if adopting common iron with the contact surface of these Ores, heavy wear will necessarily be there is, user is made need to often to carry out safeguarding and more exchange device, reduce production efficiency, add production cost；If adopting high hardness wear-resisting steel alloy, although overcome wear-out defect, but its fragility is too strong, it is easy to be hit and damaged, and this material is expensive so that this equipment is difficult to be accepted by factories and miness.

Summary of the invention

It is an object of the invention to provide the manufacture method of a kind of low-carbon and low-alloy Steel material.

The present invention adopts the following technical scheme that

Low-carbon and low-alloy Steel material, chemical element composition and mass percent thereof that it contains be: carbon 0.23-0.35%, silicon 0.2-0.5%, manganese 0.08-0.085%, cobalt 0.03-0.04%, copper 0.25-0.3%, molybdenum 0.35-0.4%, cerium 0.003-0.004%, boron 0.05-0.06%, titanium 0.02-0.04%, aluminum 0.8-0.9%, sulfur 0.07-0.075%, phosphorus 0.06-0.08%, surplus are ferrum.

The manufacture method of low-carbon and low-alloy Steel material, comprises the following steps:

(1) dispensing: with steel alloy mass percent, by following chemical composition dispensing, cobalt 0.03-0.04%, molybdenum 0.35-0.4%, cerium 0.003-0.004%, boron 0.05-0.06%, titanium 0.02-0.04%, put into smelting furnace melting, after being incubated 20-30 minute, adding copper powder and aluminium powder by mass percentage, continue melting 1-2h, tapping temperature is 1240 DEG C-1520 DEG C；Then pour into alloy block, take out air cooling standby；

(2) ferromanganese and the pig iron are put into fusing in vaccum sensitive stove in 1:3-4 ratio, add steel scrap, originate as ferrous substrate；Carry out desulfurization, deoxidation；It is subsequently adding the alloy block of step (1), after melted stirring mixing, add other residue alloying elements by constitutive material mass percent wherein again, be incubated 20-30 minute, at 1500-1600 DEG C of refine 50-60min, sampling after insulation 20-30min, after analysis ingredient, adjusting component, melts 15-25min, casting, tapping temperature is 1480-1580 DEG C；

(3) heat treatment: the foundry goods of step (2) casting is first cooled to 600-650 DEG C with 180-200 DEG C/h of speed, then is cooled to 480-500 DEG C with 80-100 DEG C/h of speed, be incubated 70-80 minute；Then carry out Quenching Treatment, the formula of quenching liquid be sodium carbonate 8-10%, potassium nitrate 1.5-2%, potassium hydroxide 1.5-3%, all the other be distilled water；Hardening heat is 600-720 DEG C, and the cool time is 4-6s.

Beneficial effects of the present invention:

The present invention ensures the steel alloy requirement to anti-impact force and toughness by adopting low-carbon (LC) and low alloying composition, the Steel material hardness of the present invention is high, content by adding with control silicon, manganese, cobalt, molybdenum, cerium and titanium simultaneously, improve its toughness, it is to avoid producing and the generation of brittle failure situation when working of crackle；The raw material of the present invention is simple, and cost is low.

Detailed description of the invention

Embodiment 1: low-carbon and low-alloy Steel material, chemical element composition and mass percent thereof that it contains be: carbon 0.28%, silicon 0.4%, manganese 0.082%, cobalt 0.035%, copper 0.28%, molybdenum 0.38%, cerium 0.0035%, boron 0.055%, titanium 0.03%, aluminum 0.85%, sulfur 0.072%, phosphorus 0.07%, surplus are ferrum.

The manufacture method of low-carbon and low-alloy Steel material, comprises the following steps:

(1) dispensing: with steel alloy mass percent, by following chemical composition dispensing, cobalt 0.035%, molybdenum 0.38%, cerium 0.0035%, boron 0.055%, titanium 0.03%, put into smelting furnace melting, after being incubated 25 minutes, adding copper powder and aluminium powder by mass percentage, continue melting 1-2h, tapping temperature is 1350 DEG C；Then pour into alloy block, take out air cooling standby；

(2) ferromanganese and the pig iron are put into fusing in vaccum sensitive stove in 1:3.5 ratio, add steel scrap, originate as ferrous substrate；Carry out desulfurization, deoxidation；It is subsequently adding the alloy block of step (1), after melted stirring mixing, add other residue alloying elements by constitutive material mass percent wherein again, be incubated 25 minutes, at 1550 DEG C of refine 55min, sampling after insulation 25min, after analysis ingredient, adjusting component, melts 20min, casting, tapping temperature is 1480 DEG C；

(3) heat treatment: the foundry goods of step (2) casting is first cooled to 620 DEG C with 190 DEG C/h of speed, then is cooled to 490 DEG C with 90 DEG C/h of speed, be incubated 75 minutes；Then carry out Quenching Treatment, the formula of quenching liquid be sodium carbonate 9%, potassium nitrate 1.8%, potassium hydroxide 1.8%, all the other be distilled water；Hardening heat is 650 DEG C, and the cool time is 5s.

The present invention manufacture alloy steel material test data: tensile strength sigma b >=1330MPa；Yield strength σ 0.2 >=1148MPa；Elongation percentage δ 5 (‰) >=19；Contraction percentage of area ψ (‰) >=24；Low-temperature impact toughness σ ku (-40 DEG C) >=37J/cm²；Hardness HRC50-55.

Claims (1)

1. a low-carbon and low-alloy Steel material, it is characterised in that: chemical element composition and mass percent thereof that it contains be: carbon 0.23-0.35%, silicon 0.2-0.5%, manganese 0.08-0.085%, cobalt 0.03-0.04%, copper 0.25-0.3%, molybdenum 0.35-0.4%, cerium 0.003-0.004%, boron 0.05-0.06%, titanium 0.02-0.04%, aluminum 0.8-0.9%, sulfur 0.07-0.075%, phosphorus 0.06-0.08%, surplus are ferrum；

The manufacture method of described low-carbon and low-alloy Steel material, comprises the following steps:

(1) dispensing: with steel alloy mass percent, by following chemical composition dispensing, cobalt 0.03-0.04%, molybdenum 0.35-0.4%, cerium 0.003-0.004%, boron 0.05-0.06%, titanium 0.02-0.04%, put into smelting furnace melting, after being incubated 20-30 minute, adding copper powder and aluminium powder by mass percentage, continue melting 1-2h, tapping temperature is 1240 DEG C-1520 DEG C；Then pour into alloy block, take out air cooling standby；

(2) ferromanganese and the pig iron are put into fusing in vaccum sensitive stove in 1:3-4 ratio, add steel scrap, originate as ferrous substrate；Carry out desulfurization, deoxidation；It is subsequently adding the alloy block of step (1), after melted stirring mixing, add other residue alloying elements by constitutive material mass percent wherein again, be incubated 20-30 minute, at 1500-1600 DEG C of refine 50-60min, sampling after insulation 20-30min, after analysis ingredient, adjusting component, melts 15-25min, casting, tapping temperature is 1480-1580 DEG C；

(3) heat treatment: the foundry goods of step (2) casting is first cooled to 600-650 DEG C with 180-200 DEG C/h of speed, then is cooled to 480-500 DEG C with 80-100 DEG C/h of speed, be incubated 70-80 minute；Then carry out Quenching Treatment, the formula of quenching liquid be sodium carbonate 8-10%, potassium nitrate 1.5-2%, potassium hydroxide 1.5-3%, all the other be distilled water；Hardening heat is 600-720 DEG C, and the cool time is 4-6s.