Steel Rectangular Bar AISI 8620 DIN 10278 DIN 1.6523 Recognized Cold Stretcted

Steel Rectangular Bar SAE 8620 A + C AISI 8620 DIN 10278 DIN 1.6523 Recognized Cold Stretcted

Grade Introduction 

SAE 8620 Alloy Steel is a low alloy nickel, chromium, molybdenum case hardening steel, generally supplied in the as - rolled condition with a maximum hardness HB 255max. SAE 8620 alloy steel offers high external strength and good internal strength, making it highly wear-resistant. SAE 8620 steel has a higher core strength than grades 8615 and 8617.

SAE 8620 alloy steel is flexible during hardening treatments, thus enabling improvement of case/core properties. Prehardened and tempered (uncarbonized) 8620 can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content. SAE 8620 alloy steel is suited for applications that require a combination of toughness and wear resistance. This grade is commonly supplied in a round bar.

Grade Application:

The SAE 8620 can be used for a number of medium - strength applications such as camshafts, fasteners, gears, and chains / chain pins.

Equivalent grades:

Addition to other grades:

MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H - 11, H - 13, CW - 1, M2, M35, M42, 2714, SKD - 11, P20, P20+S, P20 + Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.

Our Supply Range 

SAE8620, SAE8620 Steel, SAE8620 Chemical composition, SAE8620 Mechanical properties, SAE8620 Equivalent Grades, SAE8620 Steel plate, SAE8620 Steel sheet, SAE8620 Manufacturers, SAE8620 Suppliers, SAE8620 Dealers, SAE8620 Stockist, SAE8620 Distributors, SAE8620 Wholesalers, SAE8620 Traders.

Chemical composition 

The following table shows the chemical composition of SAE8620 steel 

Mechanical Properties 

Hardness 

149

Heat treatment 

This alloy may be hardened by heating to 1500 F followed by a water quench. Carburize at 1650 to 1700 F in an appropriate carburizing medium and oil quench to harden. Improved carburized case and core properties can be obtained by furnace cooling from carburizing at 1650 – 1700 F and then reheating to 1575 F.

Hardening 

The AISI steel 8620 will be austenitized at around 840°C – 870°C, and oil or water quenched depending upon section size and intricacy. Cool in Air or Oil required.

Tempering

Tempering of heat-treated and water quenched parts of SAE 8620 steel (not carburized) is done at 400 F to 1300 F to improve case toughness with minimal effect on its hardness. This will also reduce the possibility of grinding cracks.

Forging Properties 
SAE 8620 alloy steel is forged at a start temperature of around 2250ºF (1230ºC) down to approximately 1700ºF(925ºC.) prior to the hardening heat treatment or carburizing. The alloy is air cooled after forging.

Stress Relieving 

Heat to 630°C – 650°C, hold until temperature is uniform throughout the section, soak for 1 hour per 25mm section, and cool in still air.

Normalizing 

1675ºF (910ºC) and air cool. This is another method of improving machinability in 8620 material; normalizing might also be used prior to case hardening.

Annealing 

AISI 8620 steel may be given a full anneal by heat to 820℃ – 850℃, and hold until temperature is uniform throughout the section and cool in the furnace or air-cooled.

Density 

Density (lb / cu. in.) 0.283

Machinability 

The SAE 8620 alloy steel is readily machined after heat treatment and/or carburizing, should be at a minimum so as not to impair the hardened case of the part. Machining may be done by conventional means prior to heat treatment – after carburizing machining is usually limited to grinding.

Welding 

The alloy SAE 8620 may be welded as-rolled condition by conventional methods, usually gas or arc welding. Preheating at 400 F is beneficial and subsequent heating after welding is recommended – consult the approved weld procedure for the method used.