PRODUCT NAME :
alloy structure steel
STANDARD:
GB/T3077-1999 EN10083-1 EN10083-3   ISO 683-1
GRADE COMPARISION:

GB	ASTM	BS	NF	DIN
25CrMo	4125	En20A	25CD4	25CrMo4

ULTRASONIC STANDARD:
GB/T6402-2008 / SEP921-84.  ASTM A388

CHEMICAL COMPOSITION:

C	Si	Mn	P≤	S≤	Cr	Mo
0.22/0.29	0.10/0.40	0.60/0.90	0.035	0.035	0.90/1.20	0.15/0.25

HEAT TREATMENT SPECIFICATION & MECHANICAL PROPERTIES:
quenching temperature （℃）：900
Tensile strength σb (MPa)：≥885(90)
Yeild strength σs (MPa)：≥685(70)
elongation δ5 (%)：≥12 
Reduction area  ψ (%)：≥50
Impact  Akv (J)：≥35
Hardness ：≤212 
DELIVERY CONDITION :
normalized ,annealed, black surface ,rough machined or quenched & tempered , should be indicated in contract .

DIMENSION : mm

ROUND STEEL BAR		COIL ROD	WIRE	SQUARE/ FLAT
FORGED BAR	ROLLED BAR	HOT ROLLED	COLD DRAW	FORGED	ROLLED
80-650	16-250	∮5.5-20	∮0.2-13	120-800×120-800	5-38×44-150 10-90×60-305

length : forged bar free length 4-5.8M,rolled bar 5.8M. for customers special requirment, the bar length can do 20 meters long.
APPLIED RANGE:

REMARK：
Above listed parameters and sepcification only for reference . Specific parameters according to standard. Requirments beyond
standard will be negotiated by both sides.
Delivery state:annealed, spheroidal annealed, quenched & tempered ,bright bar, cold-drawn, etc.
Listed specifications are only typical grades; products of required specifications can be developed/produced as per international,
Chinese or industry standards,or

based on agreements with customers.