8620 Hot Rolled Grade 460 Ss400 8620 42CrMo4 50mm Raw Material Carbon Steel Iron Round Wire Rod Bar Price

Composition
Stainless Steel Scrap
Technique
Forged
Shape
Plate
Surface Treatment
Polished
Special Use
High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
Application
Tool Steel Bar
Surface
Milled/Bright/Black
Length
1-10m
Transport Package
Wooden
Specification
6-400mm
Trademark
Smooth
Origin
China
HS Code
7214100000
Production Capacity
5000 Ton/Year
Reference Price
$ 900.00 - 1,440.00
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Product Description

Introduction:   

AISI 8620 steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc.

1.Supply Form & Size & Tolerance
Supply Form Size(mm) Process Tolerance



Round 		Φ6-Φ100 Cold Drawn Bright/Black Best H11

Φ16-Φ350
Hot Rolled 		Black -0/+1mm
Peeled/ground Best H11

Φ90-Φ1000
Hot Forged 		Black -0/+5mm
Rough Turned -0/+3mm

Flat/Square/Block 		Thickness :120-800
Hot Forged 		Black -0/+8mm
Width:120-1500 Rough Machined -0/+3mm
Remark:Tolerance can be customized as per requests
2.Chemical Composition
Standard Grade C Si Mn P S Cr Ni Mo
ASTM A29 8620 0.18-0.23 0.15-0.35 0.7-0.9 ≤ 0.035 ≤ 0.04 0.4-0.6 0.4-0.7 0.15-0.25

EN 10084 		1.6523
0.17-0.23
≤ 0.04
0.65-0.95
≤ 0.025
≤ 0.035
0.35-0.70
0.4-0.7
0.15-0.25
20NiCrMo2-2
JIS G4103 SNCM220 0.17-0.23 0.15-0.35 0.6-0.9 ≤ 0.03 ≤ 0.03 0.4-0.65 0.4-0.7 0.15-0.3
BS 970 805M20 0.17-0.23 0.1-0.4 0.6-0.95 ≤ 0.04 ≤ 0.05 0.35-0.65 0.35-0.75 0.15-0.25
GB 3077 20CrNiMoA 0.17-0.23 0.17-0.37 0.6-0.95 ≤ 0.035 ≤ 0.035 0.4-0.7 0.35-0.75 0.2-0.3
3.Physical Property
Density g/cm3 7.85
Melting point Deg F 2600
Poisson's ratio 0.27-0.30
Machinability (AISI 1212 as 100% machinability) 65%
Thermal expansion (20 ºC)(ºC ¹) 12.2*10^-6
Specific heat capacity J/(kg*K) 477
Thermal conductivity W/(m*K) 46.6
Electric resistivity Ohm*m 2.34*10^-7
4. Mechanical Property
Typical Mechanical Properties For Core - Carburised and Oil Quenched at 840  °C
Section Size 11mm 30mm 63mm
Tensile Strength Mpa 980-1270 780-1080 690-930
Yield Strength Mpa ≥785 ≥590 ≥490
Elongation % ≥9 ≥10 ≥11
Charpy Impact J ≥41 ≥41 ≥41
Hardness HB 290-375 235-320 205-275
Hardness HRC 31-41 23-35 16-29
5.Hardenability Limits
Distance from quenched end mm 1.5 3 5 7 9 11 13 15 20 25 30 35 40
HRC Min 41 37 31 25 21 - - - - - - - -
HRC Max 48 47 43 39 35 32 30 29 26 24 23 23 23
Hardness values under 20HRC  is not specified.
6.Forging
Forging temperature should be carried out between 925ºC-1230ºC,AISI 8620 has low carbon content  which is  less susceptible to cracking than medium or high carbon steels,so  it may be heated and cooled more rapidly.Soaking time at forging temperature should be as short as possible to avoid heavy scaling and excessive grain growth.The lower the forging-ending temperature ,the finer the grain size .Don't forge below minimum forging temperature 850°C.This alloy should be cooled in sand.
7.Normalizing
Normalizing is used to refine the structure of forgings that might have cooled non-uniformly after forged,and considered as a conditioning treatment before case hardening.Normalizing temperature for AISI 8620 steel should be carried out between 900ºC-925ºC. hold suitable time for the steel to be thoroughly heated to complete the ferrite to austenite transformation.Cool in still air.This treatment is considered as another method of improving machinability.
8.Annealing
Full annealing is recommended  for AISI 8620 before machining, AISI 8620  should be carried our at a nominal temperature of 820ºC-850ºC,hold suitable time for the steel to be thoroughly heated, then furnace cooling.
9.Case Hardening
Following core refining, Heat the temperature to 780 o C - 820 o C, hold suitable time for the steel to be thoroughly heated, and quench in oil.Temper as soon as possible after quenched.
10.Tempering
Tempering   is usually carried out to relieve stresses from the hardening process,it will improve the toughness of both case and core, with only a little reduction in core strength and case hardness.Heat the AISI 8620 steel to 150 o C - 200 o C as required, hold enough time until temperature is uniform throughout the section, soak for 1 - 2 hours per 25 mm of section, and cool in still air.
11.Caburizing
Pack, salt or gas carburize at temperature  900 o C - 925 o C, holding enough  time to obtain the required case depth and carbon content, followed by a suitable hardening and tempering cycle to optimise case and core properties.
12.Applications
AISI 8620 is suited for applications which require a combination of toughness and wear resistance.It is commonly used in the engineering and automitive industries for toolholders and other such components.
Typical application:Arbors, pinions, bushes, camshafts, kingpins,ratchets, gears, splined shafts etc.


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