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

GB	ГОСТ	BS	JIS	NF	DIN
38CrMoAl	38XMIOA	905M39	SACM645	40CAD6.12	41CrAlMo07

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

CHEMICAL COMPOSITION:

C	Si	Mn	P≤	S≤	Cr	Mo	Al
0.35/0.42	0.20/0.45	0.30/0.60	0.035	0.035	1.35/1.65	0.15/0.25	0.70/1.10

HEAT TREATMENT SPECIFICATION & MECHANICAL PROPERTIES:
Quenching temperature （℃）：940
Tensile strength σb (MPa)：≥980(100) 
Yeild strength σs (MPa)：≥835(85)
elongation δ5 (%)：≥ 14
Reduction area  ψ (%)：≥50  
Impact  Akv (J)：≥71
Hardness ：≤229 
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:
Have very high nitrogenization performance and machinical perproties . Good heat resistance and stain resistance . Mostly used
for make all kinds of not large size nitrogenization parts which have high fatigue strength ,high wearing feature , demension accurate
after heat treatment , higher strength . Such as cylinder sleeve , socket sleeve , bottom cap , piston bolt , principal axis of precision
grinder, pricipal axis of lathe, boring bar , precision lead screw , gear ,worm ,high pressure valve , valve rod ,roller , some wear parts
of plastic extrusion .
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.