CN104195471A - High-strength high-tenacity alloy steel material and manufacturing method thereof - Google Patents

Abstract

The invention discloses a high-strength high-tenacity alloy steel material and a manufacturing method thereof. The high-strength high-tenacity alloy steel material contains the following chemical elements in percentage by mass: 2.4-2.6% of steel scrap, 0.028-0.045% of carbon, 0.02-0.05% of silicon, 0.01-0.012% of manganese, 0.07-0.08% of palladium, 0.01-0.015% of silver, 0.08-0.009% of tantalum, 0.30-0.32% of chromium, 0.02-0.025% of cobalt, 0.033-0.035% of tungsten, 0.02-0.35% of sulfur, less than or equal to 0.005% of phosphorus and the balance of iron. According to the manufacturing method of the high-strength high-tenacity alloy steel material, low-content alloy elements are formed into an alloy block firstly, and then the alloy block is smelted and formed into the alloy steel material together with other alloy elements; as a result, the internal atomic structure of the alloy steel is enhanced, and the alloy steel material is enabled to have the advantages of high impact resistance, less breakage possibility, high tenacity and the like; the alloy steel material is malleable and castable, so that the service life of the alloy steel is greatly prolonged and the production cost is reduced.

Description

A kind of alloy steel material of high-intensity high-tenacity and manufacture method thereof

 

Technical field

The present invention relates to a kind of steel alloy and manufacture method thereof, particularly a kind of manufacture method of alloy steel material of high-intensity high-tenacity.

 

Background technology

The steel alloy history of existing more than 100 year, is applicable in the middle of all trades and professions, at present, on market, conventional material generally has two kinds: one is high mangaenese steel, another kind is common steel alloy, high mangaenese steel good toughness but intensity is low, and common steel alloy hardness is high, wear resistance good but poor toughness.

 

Summary of the invention

The object of the present invention is to provide a kind of manufacture method of alloy steel material of high-intensity high-tenacity.

The present invention adopts following technical scheme:

The alloy steel material of high-intensity high-tenacity, chemical element composition and mass percent thereof that it contains are: steel scrap 2.4-2.6%, carbon 0.028-0.045%, silicon 0.02-0.05%, manganese 0.01-0.012%, palladium 0.07-0.08%, silver-colored 0.01-0.015%, tantalum 0.008-0.009%, chromium 0.30-0.32%, cobalt 0.02-0.025%, tungsten 0.033-0.035%, sulphur 0.02-0.35%, phosphorus≤0.005%, surplus are iron.

The manufacture method of the alloy steel material of high-intensity high-tenacity, comprises the following steps:

(1) batching: in steel alloy total mass per-cent, by following chemical composition batching, palladium 0.07-0.08%, silver-colored 0.01-0.015%, tantalum 0.008-0.009%, chromium 0.30-0.32%, cobalt 0.02-0.025%, tungsten 0.033-0.035%; Put into smelting furnace melting, tapping temperature is 1130 DEG C-1320 DEG C; Then pour into alloy block;

(2) steel scrap and scrap iron are dropped in vacuum induction furnace and melt and originate as ferrous substrate in 1:10-12 ratio; Carry out desulfurization, deoxidation; Then add the alloy block of step (1), after melting is uniformly mixed, then add carbon dust, silica flour, manganese powder by constitutive material mass percent wherein, insulation 20-30 minute, add other alloying elements of residue to vacuum induction furnace again, at 1340-1580 DEG C of refining 45-55min, after insulation 20-30min, sample, after analysis ingredient, adjusting component, fusing 10-20min, casting, tapping temperature is 1420-1580 DEG C;

(3) quench: the processing of step (2) gained casting grinding is carefully processed, foundry goods is carried out to normalizing and means of isothermal quenching, described means of isothermal quenching, adopts 300 ± 20 DEG C of salt bath austempering processing.

Beneficial effect of the present invention:

The present invention first makes alloy block by low levels alloying element, fusing is made alloy steel material with other alloying elements again, strengthen the inside atomic structure of steel alloy, make alloy steel material of the present invention there is anti-impact force strong, not easy fracture, toughness advantages of higher, it is castable that alloy steel material of the present invention is malleable, thereby greatly improve the work-ing life of steel alloy, reduced production cost.

 

Embodiment

Embodiment 1: the alloy steel material of high-intensity high-tenacity, chemical element composition and mass percent thereof that it contains are: steel scrap 2.5%, carbon 0.035%, silicon 0.04%, manganese 0.011%, palladium 0.075%, silver 0.012%, tantalum 0.008%, chromium 0.31%, cobalt 0.022%, tungsten 0.034%, sulphur 0.03%, phosphorus≤0.005%, surplus are iron.

The manufacture method of the alloy steel material of high-intensity high-tenacity, comprises the following steps:

(1) batching: in steel alloy total mass per-cent, by following chemical composition batching, palladium 0.075%, silver 0.012%, tantalum 0.008%, chromium 0.31%, cobalt 0.022%, tungsten 0.034%; Put into smelting furnace melting, tapping temperature is 1250 DEG C; Then pour into alloy block;

(2) steel scrap and scrap iron are dropped in vacuum induction furnace and melt and originate as ferrous substrate in 1:11 ratio; Carry out desulfurization, deoxidation; Then add the alloy block of step (1), after melting is uniformly mixed, then add carbon dust, silica flour, manganese powder by constitutive material mass percent wherein, be incubated 25 minutes, add other alloying elements of residue to vacuum induction furnace again, at 1550 DEG C of refining 50min, after insulation 25min, sample, after analysis ingredient, adjusting component, fusing 15min, casting, tapping temperature is 1500 DEG C;

(3) quench: the processing of step (2) gained casting grinding is carefully processed, foundry goods is carried out to normalizing and means of isothermal quenching, described means of isothermal quenching, adopts 300 ± 20 DEG C of salt bath austempering processing.

The present invention manufacture cast steel testing data: tensile strength sigma b>=1045MPa; Yield strength σ 0.2>=1035MPa; Room temperature impelling strength α ku (42 DEG C)>=64J/cm ²; Low-temperature impact toughness σ ku (40 DEG C)>=33J/cm ²; Hardness 45-50HRC.

Claims (2)

1. an alloy steel material for high-intensity high-tenacity, is characterized in that: chemical element composition and mass percent thereof that it contains are: steel scrap 2.4-2.6%, carbon 0.028-0.045%, silicon 0.02-0.05%, manganese 0.01-0.012%, palladium 0.07-0.08%, silver-colored 0.01-0.015%, tantalum 0.008-0.009%, chromium 0.30-0.32%, cobalt 0.02-0.025%, tungsten 0.033-0.035%, sulphur 0.02-0.35%, phosphorus≤0.005%, surplus are iron.

2. a manufacture method for the alloy steel material of high-intensity high-tenacity as claimed in claim 1, is characterized in that comprising the following steps:

(1) batching: in steel alloy total mass per-cent, by following chemical composition batching, palladium 0.07-0.08%, silver-colored 0.01-0.015%, tantalum 0.008-0.009%, chromium 0.30-0.32%, cobalt 0.02-0.025%, tungsten 0.033-0.035%; Put into smelting furnace melting, tapping temperature is 1130 DEG C-1320 DEG C; Then pour into alloy block;

(2) steel scrap and scrap iron are dropped in vacuum induction furnace and melt and originate as ferrous substrate in 1:10-12 ratio; Carry out desulfurization, deoxidation; Then add the alloy block of step (1), after melting is uniformly mixed, then add carbon dust, silica flour, manganese powder by constitutive material mass percent wherein, insulation 20-30 minute, add other alloying elements of residue to vacuum induction furnace again, at 1340-1580 DEG C of refining 45-55min, after insulation 20-30min, sample, after analysis ingredient, adjusting component, fusing 10-20min, casting, tapping temperature is 1420-1580 DEG C;

(3) quench: the processing of step (2) gained casting grinding is carefully processed, foundry goods is carried out to normalizing and means of isothermal quenching, described means of isothermal quenching, adopts 300 ± 20 DEG C of salt bath austempering processing.