95X18 - ei229 sheet, strip

Wire, circle

International Equivalent

Mark Analogue W. Nr. Aisi Uns En Order
95X18 EI229 Delivery from the stock, in stock

Production and application

Stainless chrome steel 95X18 is melted in open electric arc or induction furnaces. Production is regulated by GOST 5632-72; 4405-75 and 5949-75; and TU: 14-1-1848-75 и 14-1-4628-89. Strip and section steel is made by forging or rolling. Hot deformation is carried out at 1130-950°C, followed by an exposure at 750°C and cooling. It is used in the manufacture of parts with high hardness: bushings, bearings, knives, etc .

Percentage composition according to 5732-72

Alloy C Ti Ni Mn Si Cr N S P Fe Cu
95Х18 0,9-1 ≤0,2 ≤0,6 ≤0,8 ≤0,9 17-19 --- ≤0,025 ≤0,03 Basis ≤0,3

Physical properties at 20°C

Density 7.75 g/cm3, thermal conductivity 24.3 W/(m - K); specific heat capacity 0.483 - 103, J/(kg - K.

Temperature coefficient of linear expansion a

Steel grade 20 to 100 20 to 200 20 to 300 20 to 400 20 to 500 20 to 800
90X18MF 11 11,2 11,6 11,8 12,2 12,8
95Х18 11,8 12,3 12,7 13,1 13,4 -

Corrosion resistance

After quenching and low tempering to 400 °C has satisfactory corrosion resistance in 3% sodium chloride solution and water. At tempering 480-500 ° C corrosion resistance is lost due to the release of carbides.

Structure of the alloy

The steel belongs to the martensitic class. After a complete annealing the structure of steel is ledeburite with excess carbides. The microstructure of steel quenched from 900-1250°C includes martensite, austenite and carbides.

Effect of tº hardening on the properties of 90X18MF (numerator) and 95X18 (denominator)

tzack Residual austenite γ, % HRC hardness Chromium (Cr) content in solid solution, % Diameter of austenite grain, μm
900 °С <1 47 9,5 18
1000 °С - 55/55 - 16
1050 °С 26/17 57/58 11 40
1100 °С -/32 54/55 12,2 -
1150 °С 76 40 - 35
1200 °С - - 42 33
1250 °С 93 26 16.4 63

Influence of tempering temperature on the properties of 90X18MF (numerator) and 95X18 (denominator) (hardening process at 1040 °C)

tempering temperature, °C HRC hardness Residual austenite γ, % tep, °C HRC hardness 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 90Cr18MF, after an oil quenching process at 1040 °C (30 min), the critical points are as follows: Ac1 = 840 °C, Ac3 = 925 °C; Mn = 260 °C; MK = 135 °C. Due to the stability of the austenite, no phase transformation occurs after quenching from 1250 °C. Quenching temperature of 1050 °C and tempering temperature of 150-200 °C are recommended. For full softening (~ 220 NV) annealing at 880-920°C with minimum cooling rate (25°C/h) is carried out. To improve machinability during turning, annealing at 730-760°C is used. Tempering at 450- 600 °C and hardening above t° 1065 °C are not recommended, which causes grain growth and reduction of impact toughness.

Supply

The presented 95X18 grade rolled steel is certified. The technical documentation includes data on the chemical composition, the limiting percentage of impurities; mechanical properties of the products. From us you can buy in bulk any semi-finished products for large-scale production. We also offer optimum conditions for retail buyers. The high level of service and responsiveness of service is the face of our company.

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Elektrovek-Steel always has stainless steel products in stock at an optimal price. It is formed taking into account European rates for base metals, without the inclusion of additional costs. We supply certified products of domestic and foreign producers. Cooperation with us has a number of advantages. Our specialists will be happy to provide advice on purchasing any alloys, the correct choice of which will depend on the performance and durability of the equipment. We will help to determine not only the optimum parameters of the product, but also offer the best price.