Qt Heat Treament 42CrMo SAE4140 SAE8620 4145h Alloy Steel Bar

• Type: Round
• Standard: AISI, ASTM, DIN, JIS
• Composition: Ferrous Steel Scrap
• Technique: Hot Rolled or Cold Drawn or Forged
• Shape: Bar
• Surface Treatment: Black Surface or Bright Surface
• Model NO.: alloy steel bar
• Special Use: Cold Heading Steel, Mold Steel
• Application: Structural Steel Bar
• Grade: Alloy Steel Bar
• Material: SAE8620 4140 4150 42CrMo Sc440 42CrMo4
• Hot Rolled Steel Bar: Forged Steel Bar
• Cold Drawn Steel Bar: Bright Steel Ar
• Ready Stock: Yes
• Transport Package: Anti-Rust Pacakging
• Specification: 5-800mm
• Trademark: dajin
• Origin: China
• Production Capacity: 2000

Product Description

42CrMo SAE4140 SAE8620  alloy steel bar  QT heat treament

GENERAL CHARACTERISTICS OF ALLOY STEEL 8620
Alloy steel 8620 is a case-hardening steel containing nickel, chromium and molybdenum as alloying elements. The alloy shows good strength and toughness properties, and has a higher core strength than grades 8615 and 20CrNiMo.
8620 alloy steel bar chemical composition

Grade	C	Si	Mn	P	S	Cr	Ni	Mo
8620	0.18-0.23	0.15-0.35	0.70-0.90	Max 0.035	Max 0.035	0.40-0.60	0.40-0.70	0.15-0.25

8620 alloy steel bar Mechanical Property:
Grade:ASTM A29  SAE 8620  SNCM220   
Hardness:197HB  
Tensile  strength:980(100)MPA  
Yield  strength: 785(180)MPA
elogation:9%  Reduction  of  area:40%   AKV(impact  value):47J

8620 alloy steel bar  applications
This alloy may be used in the production of medium-strength parts such as forged camshafts, fasteners and gears.
8620 Alloy steel bar HEAT TREATMENT
Annealing:For optimum machinabilty, an as-forged structure is normally sufficient for this grade of alloy steel. If this proves not to be the case then an iso-anneal from around 1650ºF (900ºC) to 1225ºF (660ºC) will improve machinability.
Normalizing:1675ºF (910ºC) and air cool. This is another method of improving machinability in this grade; normalizing might also be used prior to case hardening.
Hardening:The alloy will be austenitized at around 1525ºF (830ºC) and oil or water quenched depending upon section size and intricacy.
Tempering:to desired hardness, using temperatures based on past experience, following water or oil quench.
Machinability:This grade of alloy is readily machined following suitable cooling from forging or subsequent heat treatment.
Other grade of alloy steel bar we can supply

	Steel grades	C	Si	Mn	Cr	Mo	Ni	P	S
Carbon Structure Steel	Q235(B)/SS400/S235JR/A36	≤ 0.20	≤0.35	≤1.4	0.3-0.4		≤0.30	≤ 0.045	≤ 0.045
	20#/CK22, CK20/1020/050A20/S20C	0.17-0.23	0.17-0.37	0.35-0.65	0.3-0.4		≤0.30	≤ 0.035	≤ 0.035
	45#/CK45, C45/1045/080M46/S45C	0.42-0.5	0.17-0..37	0.5-0.8	0.3-0.4		≤0.30	≤ 0.035	≤ 0.035
Alloy Structure Steel	20Cr/20Cr4/5120/527A19/SCr420H	0.18-0.24	0.17-0.37	0.50-0.80	0.70-1.00	≤0.15	≤0.30	≤ 0.035	≤ 0.035
	40Cr/41Cr4/5140/520M40/SCr440	0.37-0.44	0.17-0.37	0.5-0.8	0.8-1.1	≤0.15	≤0.30	≤ 0.035	≤ 0.035
	30CrMo/4130/1717COS110/SCM420	0.26-0.34	0.17-0.37	0.4-0.7	0.8-1.1	0.15-0.25	≤0.30	≤ 0.035	≤ 0.035
	35CrMo/34CrMo4/4135/708A37	0.32-0.40	0.17-0.37	0.4-0.7	0.8-1.1	0.15-0.25	≤0.30	≤ 0.035	≤ 0.035
	42CrMo/42CrMo4/4140/708A42/708M40	0.38-0.45	0.17-0.37	0.5-0.8	0.90-1.2	0.15-0.25	≤0.30	≤ 0.035	≤ 0.035
	8620H	0.17-0.23	0.15-0.35	0.65-0.95	0.35-0.65	0.15-0.25	0.35-0.75	≤0.025	≤ 0.035
	40CrNiMoA/40CrNiMo22/4340/871M40/SNCM439	0.37-0.44	0.17-0.37	0.50-0.80	0.60-0.90	0.15-0.25	1.25-1.65	≤ 0.025	≤ 0.025
Spring Steel	55Si2Mn/55Si7/9255/250A53/SUP6	0.52-0.60	1.50-2.00	0.60-0.90	≤0.35		≤0.35	≤ 0.035	≤ 0.035
	60Si2MnA/65Si7/9260/250A61/SUP7	0.56-0.64	1.60-2.00	0.70-1.00	0.3-0.4		≤0.35	≤ 0.025	≤ 0.025
	50CrVA/50CrVA/6150/735A50/SUP10	0.47-0.54	0.17-0.37	0.50-0.80	0.80-1.10	≤0.15	≤0.30	≤ 0.025	≤ 0.025
	GCr15/100Cr6/E52100/534A99/SUJ2	0.95-1.05	0.15-0.35	0.25-0.45	1.40-1.65	≤0.10	≤0.30	≤ 0.025	≤ 0.025
Bearing  Steel	52100	0.93-1.05	0.15-0.35	0.25-0.45	1.35-1.60	≤0.10	≤0.25	≤ 0.025	≤ 0.015

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