21NiCrMo2 / 1.6526 Steel
21NiCrMo2 steel is a common nickel-molybdenum alloy steel accding to DIN standard,and 1.6526 steel is as per W-Nr Germany standard.After carburizing,the surface has a high degree of hardness, abrasion resistance and contact fatigue strength.At the same time,the core remains good toughness and can withstand the high impact load.
Carbon:0.17/0.23; Silicon:Max0.40; Manganese:0.65/0.95;
Chromium:0.35/0.70; Molybdenum:0.15/0.25; Nickel:0.40/0.70;
AISI/ASTM: 8620; JIS/KS: SNCM220;
EN 10277 – 4 : 2008 Bright steel products. Technical delivery conditions. Case hardening steels
EN 10084 : 2008 Case hardening steels. Technical delivery conditions
EN 10263 – 3 : 2001 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for case hardening steels
4.Form & Size
– DIN 21NiCrMo2 Alloy Steel as Forged
1)Fuhongsteel manufactures and supplies 21NiCrMo2 forged steel round bars,square bar,flat bar,shaft,and blocks.
2)DIN 21NiCrMo2 alloy steel size available:
(Forged flat bars,Blocks,Shafts and forging pieces can be customized)
-W-Nr 1.6526 Alloy Steel as Rolled
1)Fuhongsteel is a quality steel supplier of 1.6526 rolled steel round bars.
2)W-Nr 1.6526 alloy steel round bar size available:
Length: 3,000-10,000mm(can be customized)
5.Tolerances on Dimension & Straightness
3)Deviation from straightness:with 360° rotary device 2mm/meter(max)
1)Chemical composition:Related DIN 7527-6 , EN 10250-3
2)Mechanical properties -Tensile strength -Yield point -Percentage reduction of area after fracture -Elongation after fracture -Impact test: Impact test must be done on three (3) different ISO-V samples at +20 C°
3)Non metallic inclusions
4)Grain size:According to DIN 50601 more than 5,preferred to 8;
5)Ultra sonic testing 360° complete round testing: Ultra sonic according to EN 10228-3
21NiCrMo2 steel is widely used in driving bevel gears,crown wheels,shafts,bolts for automotive and gear components. DIN 1.6526 is also suitable for direct hardening.
1)Preheat 1.6526 forged alloy steel carefully.
2)Raise the forging temperature up to 1150-1200°C.
3)Keep the forging temperature above 850°C.
Hardening&Tempering(quenched and tempered and after stress relieved)
1)Heating 21NiCrMo2 steel uniformly to 850°C;
2)W-Nr 1.6526 alloy steel should be quenched in the oil;
3)Heat the material to the temperature 550°C;
4)Soak at this temperature for at least 2 hours;
5)1.6526 alloy steel should be cooled in the furnace.
In case after QT a straightening process is necessary then the products should be tempered and distorsion-poor annealed with at least more than 625°C.
1)Heating 1.6526 forged steel thoroughly to 800-850°C;
2)Cool slowly to the temperature 550°;
3)Complete annealing the steel in the air.
1)heat DIN 1.6526 steel until the temperature up to 850°C;
2)Then cool 21NiCrMo2 steel down to the room temperature in the air.
Enquiry for DIN 21NiCrMo2 / 1.6526 steel Round Rods,Square/Flat Bars,Rollers,Shafts and Blocks.