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615/S41800
2016-01-06 09:52:04   Source:   Criticism:0 CTR:

The 615/S41800 is special steel, and is low temperature of Structural steel in Germany, we can produce 615/S41800 plate,615/S41800 flat,615/S41800 belt,615/S41800 sheet,615/S41800 wire coil,615/S41800 square bar,615/S41800 round rod,615/S41800 pipe,615/S41800 forged valve body,615/S41800 forged rings, 615/S41800 forged multidiameter shafts etc for this steel.
Steel Grade|ASTM: 615
Steel Grade|UNS: S41800
   
CHEMICAL COMPOSITION(615/S41800)
C(%): 0.15~0.20
Si(%): ≤0.50
Mn(%): ≤0.50
P(%)≤: 0.04
S(%)≤: 0.03
Cr(%): 12.0~14.0
Ni(%): 1.80~2.20
Mo(%): ≤0.50
Other(%): W2.50~3.50
     
HEAT TREATMENT (615/S41800)    
Treatment condition: A:Annealing HT:981~10080℃Air/Oil Cold,≥620℃×2hTempering
σb≥/Mpa: 965
σ0.2≥/Mpa: 760
δ≥(%): 15
ψ≥(%): 45
Akv≥/J:
Hardness HBS: ≤311 302~352
     

 

Introduction High Temperature Alloys Steel(615/S41800)
According to the existing theory, 760 ℃ high temperature materials according to the matrix elements mainly can be divided into high temperature iron base alloy, nickel base superalloy and cobalt-based superalloy.According to the preparation process can be divided into deformation and high temperature alloy, casting high temperature alloy powder metallurgy superalloy.By strengthening methods with solid solution strengthening, precipitation strengthening, oxide dispersion strengthened with fiber reinforced type, etc.High temperature alloy is mainly used in the manufacture of aviation, ships, and industrial gas turbine turbine blades, guide vane, combustion chamber and turbine disc, high-pressure compressor plate of high temperature components, also used in the manufacture of aerospace aircraft, rocket, nuclear reactors, petrochemical equipment, and the conversion of coal and other energy conversion device.
Classification of High Temperature Alloys Steel(615/S41800)
High temperature alloy is divided into three kinds of material: 760 ℃ high-temperature material, high temperature of 1200 ℃ and 1500 ℃ high temperature materials, the tensile strength of 800 mpa.Or refers to the 760-1500 ℃ above and the conditions of stress, the long-term work of the high temperature metal material, has excellent high temperature strength, good resistance to oxidation and thermal corrosion resistance, good fatigue properties, fracture toughness and other comprehensive performance, has become a military and civilian use of gas turbine engine hot end components an irreplaceable key materials.
Improve Strength(615/S41800)
1, solid solution strengthening: add elements of different size with matrix metal atoms, chromium, tungsten, molybdenum, etc.) cause the distortion of the matrix metal lattice, join can reduce the alloy substrate can stacking fault elements, such as cobalt and join will slow down the rate of diffusion of matrix elements (tungsten, molybdenum, etc.), to strengthen the matrix.
2, precipitation strengthening: by aging treatment, the second phase precipitation from the supersaturated solid solution (gamma, gamma ", carbide, etc.), to strengthen the alloy. Gamma 'matrix with the same, all is face-centered cubic structure, the lattice constant and the substrate, and with crystal lattice, so gamma phase are tiny particles in the matrix can be homogeneous precipitation, hinder dislocation motion, and have a significant reinforcement.
3, grain boundary strengthening: under high temperature, the alloy grain boundary is the weak link, add trace boron and zirconium and rare earth elements can improve the grain boundary strength.This is because of rare earth elements can purify grain boundary, boron, zirconium atomic energy filling grain boundary space, reduce the grain boundary diffusion rate in the process of creep, inhibition of grain boundary carbide spheroidizing of agglomeration and promote grain boundary in the second phase.In addition, add the right amount of casting alloy hafnium, also can improve the strength and plasticity of grain boundary.Through heat treatment on the grain boundary carbide or cause bending formation chain distribution of grain boundary, improve the plasticity and strength.
4,Oxide dispersion strengthened: by powder metallurgy method, remained stable under the high temperature alloy with little oxide, the dispersion distribution status, thereby gaining obvious reinforcement effect.Usually join oxides such as ThO2 and Y2O3.These oxide is through the obstacles to dislocation motion and stable dislocation structure and other factors and strengthen the alloy.

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