Unlock instant, AI-driven research and patent intelligence for your innovation.

38CrMoAl steel and preparation method thereof

A technology of steel scraps and squares, applied in the field of alloy steel, can solve the problems of high price, serious environmental pollution, increased production cost, etc., and achieve the effects of improving hardenability, high organizational purity and prolonging service life.

Inactive Publication Date: 2011-11-02
江苏环立板带轧辊有限公司
View PDF5 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]However, in the production process of the above-mentioned 38CrMoAl steel, expensive ferromolybdenum and ferrochrome alloys need to be added, resulting in an increase in the production cost of the steel
In addition, 38CrMoAl steel is often smelted by electric arc furnace, which causes serious environmental pollution.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 38CrMoAl steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The 38CrMoAl steel is smelted in a 5-ton alkaline power frequency induction furnace. The specific preparation steps are:

[0034] 1) 25% 35CrMo steel shavings, 30% 42CrMo steel shavings, 41.745% 38CrMoAl steel shavings, 1.6% metal aluminum, 0.7% medium carbon ferrochrome, 0.3% rare earth ferrosilicon, 0.6% by mass percentage % nitrogen-containing ferromanganese, 0.025% ferroboron and 0.030% bismuth metal are mixed together, and compacted on a press to a size of (150-250) mm×(150-250) mm×(150-250) mm Then put the compacted block into the induction furnace to heat and melt it, and it will be released when the temperature of the molten steel reaches 1620°C; the weight % of the chemical elements of the 35CrMo steel shavings is: 0.32-0.40%C, 0.17-0.37%Si, 0.40 ~0.70%Mn, 0.80~1.10%Cr, 0.15~0.25%Mo, ≤0.035%S, ≤0.035%P, ≤0.030%Cu and ≤0.030%Ni, the balance is Fe, the weight of the chemical elements of 42CrMo steel shavings % is: 0.38~0.45%C, 0.17~0.37%Si, 0.50~0.80%Mn, 0.90...

Embodiment 2

[0039] 38CrMoAl steel is smelted in a 5-ton alkaline power frequency induction furnace, and the specific preparation steps are:

[0040] 1) 30% 35CrMo steel shavings, 25% 42CrMo steel shavings, 41.345% 38CrMoAl steel shavings, 1.8% metal aluminum, 0.9% medium carbon ferrochromium, 0.5% rare earth ferrosilicon, 0.4% by mass percentage % nitrogen-containing ferromanganese, 0.015% ferroboron and 0.040% bismuth metal are mixed together, and compacted on a press to a size of (150-250) mm×(150-250) mm×(150-250) mm squares, and then put the compacted squares into the induction furnace to heat and melt them. When the temperature of the molten steel reaches 1649°C, it is out of the furnace; the weight % of the chemical elements of the 35CrMo steel shavings is: 0.32-0.40%C, 0.17-0.37%Si, 0.40~0.70%Mn, 0.80~1.10%Cr, 0.15~0.25%Mo, ≤0.035%S, ≤0.035%P, ≤0.030%Cu and ≤0.030%Ni, the balance is Fe, the chemical element of 42CrMo steel shavings The weight % is: 0.38~0.45%C, 0.17~0.37%Si, 0...

Embodiment 3

[0045] 38CrMoAl steel is smelted in a 10-ton alkaline power frequency induction furnace, and the specific preparation steps are:

[0046] 1) 29% 35CrMo steel scrap, 29.545% 42CrMo steel scrap, 38% 38CrMoAl steel scrap, 1.7% metal aluminum, 0.8% medium carbon ferrochromium, 0.4% rare earth ferrosilicon, 0.5% by mass percentage % of nitrogen-containing ferromanganese, 0.020% of ferroboron and 0.035% of metal bismuth are mixed together, and compacted on a press to a size of (150-250) mm×(150-250) mm×(150-250) mm squares, and then put the compacted squares into the induction furnace to heat and melt them. When the temperature of the molten steel reaches 1637°C, it is out of the furnace; the weight % of the chemical elements of the 35CrMo steel shavings is: 0.32~0.40%C, 0.17~0.37%Si, 0.40~0.70%Mn, 0.80~1.10%Cr, 0.15~0.25%Mo, ≤0.035%S, ≤0.035%P, ≤0.030%Cu and ≤0.030%Ni, the balance is Fe, the chemical element of 42CrMo steel shavings The weight % is: 0.38~0.45%C, 0.17~0.37%Si, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention relates to 38CrMoAl steel and a preparation method thereof, and belongs to the technical field of alloy steel. The 38CrMoAl steel comprises the following raw materials in percentage by mass: 25 to 30 percent of 35CrMo steel cuttings, 25 to 30 percent of 42CrMo steel cuttings, 38 to 43 percent of 38CrMoAl steel cuttings, 1.6 to 1.8 percent of metallic aluminum, 0.7 to 0.9 percent of medium carbon ferrochromium, 0.3 to 0.5 percent of rare-earth ferrosilicon, 0.4 to 0.6 percent of nitrogenous ferromanganese, 0.015 to 0.025 percent of ferroboron and 0.030 to 0.040 percent of metal bismuth. The 38CrMoAl steel and the preparation method have the advantages that: the production cost is low, and compared with the conventional method for producing the 38CrMoAl steel, the cost of per ton steel is reduced by 800 to 1,000 RMB; the purity of texture is high for the steel contains few inclusions, the solidification texture is fine, and the segregation of alloy elements in the steel is light; the 38CrMoAl steel is alloyed by adding ferroboron, so that the hardenability of the steel can be improved obviously; the brittleness of a nitriding layer can be reduced, the toughness of the nitriding layer is can be improved, and the abrasion performance of the nitriding layer can be improved; the strength and toughness of the steel are high; and the surface hardness is between 1,200 and 1,250 HV, and the service life is prolonged by 25 to 40 percent compared with that of the conventional ionic nitriding 38CrMoAl steel.

Description

technical field [0001] The invention relates to a nitriding alloy steel and a preparation method thereof, in particular to a 38CrMoAl steel and a preparation method thereof, and belongs to the technical field of alloy steel. Background technique [0002] 38CrMoAl steel is a typical nitrided steel, its material composition is 0.35-0.42%C, 0.30-0.60%Mn, 0.20-0.45%Si, 1.35-1.65%Cr, 0.15-0.25%Mo, 0.70-1.10%Al, ≤ 0.035%S, ≤0.035%P, ≤0.030%Ni, ≤0.030%Cu. 38CrMoAl undergoes ion nitriding treatment after quenching and tempering treatment. The quenching and tempering treatment process is quenching temperature 930°C-950°C, water cooling or oil cooling; tempering temperature is 600-680°C, water cooling or oil cooling. The tensile strength σ after quenching and tempering treatment b ≥980 MPa, yield strength σ s ≥835 MPa, elongation δ 5 ≥14%, reduction of area ψ≥50%, impact energy A kv ≥71 J, impact toughness value α kv ≥88 J / cm2, hardness ≤229HB. The surface hardne...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C33/04C21D8/00
CPCY02P10/20
Inventor 浦建明浦嫣花符寒光
Owner 江苏环立板带轧辊有限公司