95X18 - ei229 sheet, strip
Production and Application
Stainless steel chrome 95X18 smelted in an open electric arc or induction furnaces. Production regulated GOST 5632−72; 4405−75 and 5949−75; as well as TS: 14−1-1848−75 and 14−1-4628−89. Bandpass Steel, manufactured by forging or rolling. Hot deformation is carried out at 1130−950 ° C, followed by holding at 750 ° C and cooling. Used in the manufacture of parts having high hardness: bushings, bearings, knives, etc…
The percentage of the soglvno 5732−72
Physical quality at 20 ° C.
Density 7.75 g / cm3, the thermal conductivity of 24.3 W / (m · K); specific heat of 0.483 · 103 J / (kg · K
Temperature coefficient of linear expansion and
|steel grade||From 20 to 100||From 20 to 200||From 20 to 300||From 20 to 400||From 20 to 500||From 20 to 800|
Resistance to corrosion
After quenching and low temperature tempering up to 400 ° C has a satisfactory resistance to corrosion in 3% NaCl solution and water. During tempering 480−500 ° C the corrosion resistance is lost due to precipitation of carbides.
Steel refers to the martensitic class. After complete annealing structure ledeburite steel with excess carbides. Microstructure of steel, hardened to 900−1250 ° C, comprises martensite, austenite and carbides.
The effect of quenching on the properties tº 90H18MF (numerator) and 95X18 (denominator)
|tzak||The residual austenite γ,%||hardness HRC||The content of chromium (Cr) in solid solution,%||The austenite grain diameter, microns|
|900 ° C||<1||47||9.5||18|
|1000 ° C||-||55/55||-||16|
|1050 ° C||26/17||57/58||eleven||40|
|1100 ° C||— / 32||54/55||12.2||-|
|1150 ° C||76||40||-||35|
|1200 ° C||-||-||42||33|
|1250 ° C||93||26||16.4||63|
Influence of annealing temperature on the properties 90H18MF (numerator) and 95X18 (denominator) (quenching process 1040 ° C)
|totp, ° C||hardness HRC||The residual austenite γ,%||totp, ° C||hardness HRC||The residual austenite γ,%|
|140||57/56||17/15||670||33 / -||0 / -|
|300||52/51||12/12||750||27 / -||15/-|
|500||55 / -||-||900||60 / -||0 / -|
|600||40 / -||-||-||-||-|
For 90H18MF, after hardening in oil from 1040 ° C (30 min), the critical points are: Ac1 = 840 ° C, Ac3 = 925 ° C; Mn = 260 ° C; MC = 135 ° C. Due to the stability of the austenite after hardening from 1250 ° C no phase transformations occur. Recommend quenching temperature of 1050 ° C and tempering 150−200 ° C. For a complete softening (~ 220 HB) is carried out annealing at 880−920 ° C with minimal cooling rate (25 ° C / hr). To improve the machinability in turning using annealing at 730−760 ° C. Not recommended tempering at 450 to 600 ° C and t ° quenching above 1065 ° C, which causes grain growth and decrease toughness.
Presented 95X18 rental brand certified. The technical documentation includes data on the chemical composition, the limiting percent impurities; mechanical properties of products. We can buy in bulk, any semi-finished products for large-scale productions. We also offer optimal conditions for retail customers. High level of service and efficiency of service are the face of our company.
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