Most international buyers,they can not accurate distinction material standard in china，as a professional iron casting and machining factory,
I make a detailed list to help buyer better understand each international Material Equivalents:

SAE / AISI / ASTM	GB (China)	DIN (Germany)	JIS (Japan)
12L14	Y15Pb	220Mo7Pb	SUM24L
1015 / 1018	GB-15	CK15	-
1020 / 1023 / 1026	GB-20	C22	-
A311  (Stressproof)  / 1144 HS	Y45MnS	44SMn28 ( ISO )	SUM43 ( JIS G 4804 )
A36	Q235	USt37-2	SS400

                                                                        Alloy Steel
                                                                        

SAE / AISI / ASTM	GB (China)	DIN (Germany)	JIS (Japan)
4130	30CrMo	25CrM04	SCM2
4140	40CrMo	41CrMo4	SCM4
4142	42CrMo	42CrMo4	SCM2
4130 HT, Rc28-32	30CrMo+QT, Rc28-32	25CrMo4+QT, Rc28-32	SCM2+QT, Rc28-32
4140 HT, Rc28-32	42CrMo+QT, Rc28-32	42CrMo4+QT, Rc28-32	SCM4+QT, Rc28-32
4142 HT, Rc28-32	42CrMo+QT, Rc28-32	42CrMo4+QT, Rc28-32	SCM4+QT, Rc28-32

                                                                      Carburizing Steel
                                                                        
                                                                         

SAE / AISI / ASTM	GB (China)	DIN (Germany)	JIS (Japan)
8620 / 86L20	20NiCrMo2	20NiCrMo2	20NiCrMo2

                                                                       Aluminum Billet / Plate
                                                                       

ASM ( USA )	GB (China)	ISO (Germany)	JIS (Japan)
6061 T6 / T651	6061 (LD30) (T 3190-1996)	AlMg1SiCu (209.1-1989)	A6061 (H4000/40-1999)
5083 ( K100 )	6082 T651 Pre-Stretched	-	-

                                                                       Aluminum Die Cast / Sand Molded / Permanent mold
                                                                       

ASM ( USA )	GB (China)	ISO (Germany)	JIS (Japan)
A356	Al-Si7Mg	G-ALSi7Mg	AC4C
A380	Al-Si8Cu3Fe	G-AlSi8Cu3(226)	AC4B / ADC10
384	AL-Si10Cu2Fe	-	ADC12

                                                                         Material Interchangeability / Allowable Substitutions

                                                                        

Type	Materials	Hardness Minimum (HB)	Hardness Maximum (HB)	Condition or Treatment
Steel	1015, 1018, 1020, 1023, 1026	110	170	COLD DRAWN OR HOT ROLLED
Steel	1214, 12L14	To Print	To Print	CARBURIZED
Steel	A311, 1144	245	255	COLD DRAWN
Alloy Steel	4130, 4140, 4142	To Print	To Print	THROUGH HARDEN
Alloy Steel	8620, 86L20	To Print	To Print	CARBURIZED
Aluminum	6061-T6, 6061-T651	90	100	BAR/PLATE STOCK
Aluminum	356-T6, A356-T6  (SAND/PERM MOLD)	80	110	HEAT TREATED
Aluminum	A380, A384  (PRESSURE DIE CAST)	80	90	AS CAST