ASTM A668

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We are professional ASTM A668/A668M/A 668 CL B CL C cl E Cl D CL F Class E Class D CLass C Class B Class A Class F G J K L M N Cl.C Cl.B Cl.D CL.E CL.F Forged Forging Steel HYDRAULIC hydroelectric power TURBINE WICKET GATE SHAFT Water Hydro Turbine Hollow shafts Gas Steam Turbine Generator Rotor Shafts,ASTM A668/A668M/A 668 CL B CL C cl E Cl D CL F Class E Class D CLass C Class B Class A Class F G J K L M N Cl.C Cl.B Cl.D CL.E CL.F Forged forging Steel Round Bars Rods Square rectangular rectangle Flat Hex Bars,STM A668/A668M/A 668 CL B CL C cl E Cl D CL F Class E Class D CLass C Class B Class A Class F G J K L M N Cl.C Cl.B Cl.D CL.E CL.F Forged Forging Steel Hollow Bars Forged Forging Sleeves Bushes Bushing Pipes Piping tube tubings barrels Casing Cases Shells cylinders hubs housings,ASTM A668/A668M/A 668 CL B CL C cl E Cl D CL F Class E Class D CLass C Class B Class A Class F G J K L M N Cl.C Cl.B Cl.D CL.E CL.F Forged Forging Steel rings Seamless Rolled Rings,ASTM A668/A668M/A 668 CL B CL C cl E Cl D CL F Class E Class D CLass C Class B Class A Class F G J K L M N Cl.C Cl.B Cl.D CL.E CL.FForged Forging Steel Blocks Discs Disks Plates,STM A668/A668M/A 668 CL B CL C cl E Cl D CL F Class E Class D CLass C Class B Class A Class F G J K L M N Cl.C Cl.B Cl.D CL.E CL.F forged forging parts Forged Products forged forging pieces forged forging steel components materials From china/

A668 Chemical Requirements

Element	Classes A to F and AH to FH	Classes G to N and GH to NH
Manganese % max	1.35	-
Phosphorous % max	0.050	0.040
Sulfur % max	0.050	0.040

A668 Mechanical Requirements

Class	Size, inches	Tensile, min ksi	Yield, min ksi	Elong, % min in 2”	RA, % min	Hardness, HBN
Classes with an added ‘H’ are supplied on the basis of hardness values only. For example, AH. Classes A-F are carbon steel, classes G-N are alloy steel
A	Up to 20	47	-	-	-	183 max
B	Up to 20	60	30	24	36	120-174
C	Up to 12	66	33	23	36	137-183
C	12 to 20	66	33	22	34	137-183
D	Up to 8	75	37.5	24	40	149-207
	8 to 12	75	37.5	22	35	149-207
	12 to 20	75	37.5	20	19	149-207
	Over 20	75	37.5	19	30	149-207
E	Up to 8	85	44	25	40	174-217
	8 to 12	85	44	23	37	174-217
	12 to 20	83	43	22	35	174-217
F	Up to 4	90	55	20	39	187-235
	4 to 7	85	50	20	39	174-217
	7 to 10	85	50	19	37	174-217
	10 to 20	82	48	19	36	174-217
G	Up to 12	80	50	24	40	163-207
G	12 to 20	80	50	22	38	163-207
H	Up to 7	90	60	22	44	187-235
	7 to 10	90	58	21	42	187-235
	10 to 20	90	58	18	40	187-235
J	Up to 7	95	70	20	50	197-255
	7 to 10	90	65	20	50	187-235
	10 to 20	90	65	18	48	207-255
K	Up to 7	105	80	20	50	212-269
	7 to 10	100	75	19	50	207-269
	10 to 20	100	75	18	48	207-269
L	Up to 4	125	105	16	50	255-321
	4 to 7	115	95	16	45	235-302
	7 to 10	110	85	16	45	223-293
	10 to 20	110	85	14	40	223-293
M	Up to 4	145	120	15	45	293-352
	4 to 7	140	115	14	40	285-341
	7 to 10	135	110	13	40	269-331
	10 to 20	135	110	12	38	269-341
N	Up to 4	170	140	13	40	331-401
	4 to 7	165	135	12	35	331-401
	7 to 10	160	130	11	35	321-388
	10 to 20	160	130	11	35	321-402

A668 Heat Treatment

Class	Heat Treatment
Classes with an added ‘H’ are supplied on the basis of hardness values only. For example, AH.
A	Untreated
B	Annealed, or normalized, or normalized and tempered
C	Annealed, or normalized, or normalized and tempered
D	Annealed, or normalized, or normalized and tempered
E	Normalized and tempered or double normalized and tempered
F	Quenched and tempered, or normalized, quenched and tempered
G	Annealed, or normalized, or normalized and tempered
H	Normalized and tempered
J	Normalized and tempered, or normalized, quenched and tempered
K	Normalized, quenched and tempered
L	Normalized, quenched and tempered
M	Normalized, quenched and tempered
N	Normalized, quenched and tempered