Language

PRODUCT CENTER

PRODUCTS

alloy steel round bar 34CrNiMo6 30CrNiMo8

alloy steel round bar 34CrNiMo6 30CrNiMo8

Category:

Steel Bars

Brief description:

It is characterized by high strength, toughness and good hardenability and stability against overheating, but it has high sensitivity to white spots and temper brittleness. Weldability is poor, before welding need to be preheated by high temperature, after welding need to eliminate stress, after adjusting the quality of use.

Key words:

Product Description

Table 1 — Steel grades and chemical composition (cast analysis)

Chemical composition % by mass( a,b)

Steel designation

Name

max.

34CrMo4

0,30 to 0.37

0,40

0,60 to 0,90

0,025

max. 0,035

0,90 to 1,20

0,035 0,90 to 1,20

0,15 to 0,30

- --

- -

34CrMoS4

0,30 to 0.37

0,40

0,60 to 0,90

0,025

max. 0,035

0,90 to 1,20

0,15 to 0,30

- --

- -

42CrMo4

0,38 to 0,45

0,40

0,60 to 0,90

0,025

max. 0,035

0,90 to 1,20

0,15 to 0,30

- --

- -

42CrMoS4

0,38 to 0,45

0,40

0,60 to 0,90

0,025

0,020 to 0,040

0,90 to 1,20

0,15 to 0,30

- --

- -

34CrNiMo6

0,30 to 0,38

0,40

0,50 to 0,80

0,025

max. 0,035

1,30 to 1,70

0,15 to 0,30

1,30 to1,70

- --

- -

30CrNiMo8

0,26 to 0,34

0,40

0,50 to 0,80

0,025

max. 0,035

1,80 to 2,20

0,30 to 0,50

1,80 to 2,20

a .Elements not quoted in this table shall not be intentionally added to the steel without the agreement of the purchaser, other than for the purpose of finishing the heat and for boron to have its effect on the hardenability. All reasonable precautions shall be taken to prevent the addition of such elements from scrap or other material used in the manufacture which affect the hardenability, mechanical properties and applicability.

B. Where requirements are made on hardenability (see Tables 5 and 6) or on the mechanical properties in the quenched and tempered condition (see Table 8), slight deviations from the limits for the cast analysis are permissible, except for the elements carbon, phosphorus and sulfur; the deviations shall not exceed the specifications of Table 4.

C. Steels with improved machinability as a result of the addition of higher sulphur contents up to around 0,10% S (including resulphurized steels with controlled inclusion content (e.g. Ca-treatment)) may be supplied on request. In this case the upper limit for the manganese content may be increased by 0,15 %.

Table 2 — Limiting values for the "C" scale Rockwell hardness for special steel grades with (normal) hardenability requirements (+H grades)

Steel designation	Symbol	Limits of	Distance in mm from quenched end
Name		range	Hardness in HRC

			1.5	3	5	7	9	11	13	15	20	25	30	35	40	45	50
Steels without boron
Steels without boron
34CrMo4	+H	max	57	57	57	56	55	54	53	52	48	45	43	41	40	40	39
34CrMoS4	+H	min	49	49	48	45	42	39	36	34	30	28	27	26	25	24	24
42CrMo4	+H	max	61	61	61	60	60	59	59	58	56	53	51	48	47	46	45
42CrMoS4	+H	min	53	53	52	51	49	43	40	37	34	32	31	30	30	29	29
34CrNiMo6	+H	max	58	58	58	58	57	57	57	57	57	57	57	57	57	57	57
		min	50	50	50	50	49	48	48	48	48	47	47	47	46	45	44
30CrNiMo8	+H	max	56	56	56	56	55	55	55	55	55	54	54	54	54	54	54
		min	48	48	48	48	47	47	47	46	46	45	45	44	44	43	43

Table 3 — Limiting values for the C scale Rockwell hardness for special steel grades with restricted hardenability scatter bands

(+HH and +HL grades)

Steel designation	Symbol	Limits of	Distance in mm from quenched end
Name		range	Hardness in HRC

			1.5	3	5	7	9	11	13	15	20	25	30	35	40	45	50
Steels without boron
Steels without boron
34CrMo4	+HH	max	57	57	57	56	55	54	53	52	48	45	43	41	40	40	39
		min	52	52	51	49	46	44	42	40	36	34	32	31	30	29	29
34CrMoS4	+HL	max	54	54	54	52	51	49	47	46	42	39	38	36	35	35	34
		min	49	49	48	45	42	39	36	34	30	28	27	26	25	24	24
42CrMo4	+HH	max	61	61	61	60	60	59	59	58	56	53	51	48	47	46	45
		min	56	56	55	54	52	48	46	44	41	39	38	36	36	35	34
42CrMoS4	+HL	max	58	58	58	57	56	54	53	51	49	46	44	42	41	40	40
		min	53	53	52	51	49	43	40	37	34	32	31	30	30	29	29
34CrNiMo6	+HH	max	58	58	58	58	57	57	57	57	57	57	57	57	57	57	57
		min	53	53	53	53	52	51	51	51	51	50	50	50	50	49	48
	+HL	max	55	55	55	55	54	54	54	54	54	54	54	54	53	53	53
		min	50	50	50	50	49	48	48	48	48	47	47	47	46	45	44
30CrNiMo8	+HH	max	56	56	56	56	55	55	55	55	55	54	54	54	54	54	54
		min	51	51	51	51	50	50	50	49	49	48	48	47	47	47	47
	+HL	max	53	53	53	52	52	50	50	50	48	48	45	45	-	-	-
		min	48	48	48	48	47	47	47	46	46	45	45	44	44	43	43

Table 4— Maximum hardness for products to be supplied in the "treated to improve shearability (+S)" or "soft annealed (+A)" condition

Steel designation a Name	Max. HBW in condition b
	+S	+A
34CrMo4，34CrMoS4	255c	223

42CrMo4,42CrMoS4	255c	241

34CrNiMo6	-d	248
30CrNiMo8	-d	248
a The values apply also for the steel with hardenability requirements (+H-, +HH- and +HL-grades) covered in Tables 5 and 6; see, however, footnote c.
b The values are not applicable to slabs which have been continuously cast and not further deformed. c Depending on the chemical composition of the cast, and on the dimensions, particularly in the case of the +HH-grades, soft annealing may be necessary.
d Where the shearability is of importance, this steel should be ordered in the "soft-annealed" condition.
e Shearable in the untreated condition.
f Condition +A is not applicable for boron steels.

Table 5 — Mechanical properties a at room temperature in the quenched and tempered condition (+QT)

Steel designation Name	Mechanical properties for the ruling section (see EN 10083-1:2006, Annex A) with a diameter (d) or for flat products thickness (t) of
d≤ 16 mm ,t≤ 8 mm
	Re min.	Rm	A min	Z min	KV b min
	MPac	MPac	%	%	J
34CrMo4	800	1000-1200	11	45	-
34CrMoS4	800	1000-1200	11	45	-
42CrMo4	900	1100-1300	10	40	-
42CrMoS4	900	1100-1300	10	40	-
34CrNiMo6	1000	1200-1400	9	40	-
30CrNiMo8	1050	1250-1450	9	40	-

Steel designation Name	Mechanical properties for the ruling section (see EN 10083-1:2006, Annex A) with a diameter (d) or for flat products thickness (t) of
16 mm < d≤ 40 mm ,8 mm < t≤ 20 mm
	Re min.	Rm	A min	Z min	KV b min
	MPac	MPac	%	%	J
34CrMo4	650	900-1000	12	50	40
34CrMoS4	650	900-1000	12	50	40
42CrMo4	750	1000-1200	11	45	35
42CrMoS4	750	1000-1200	11	45	35
34CrNiMo6	900	1100-1300	10	45	45
30CrNiMo8	1050	1250-1450	9	40	30

Steel designation Name	Mechanical properties for the ruling section (see EN 10083-1:2006, Annex A) with a diameter (d) or for flat products thickness (t) of
40 mm < d≤ 100 mm,20 mm < t≤ 60 mm
	Re min.	Rm	A min	Z min	KV b min
	MPac	MPac	%	%	J
34CrMo4	550	800-950	14	55	45
34CrMoS4	550	800-950	14	55	45
42CrMo4	650	900-1100	12	50	35
42CrMoS4	650	900-1100	12	50	35
34CrNiMo6	700	1000-1200	11	50	45
30CrNiMo8	800	1000-1300	10	45	35

Steel designation Name	Mechanical properties for the ruling section (see EN 10083-1:2006, Annex A) with a diameter (d) or for flat products thickness (t) of
100 mm < d≤ 160 mm,60 mm < t≤ 100 mm
	Re min.	Rm	A min	Z min	KV b min
	MPac	MPac	%	%	J
34CrMo4	500	750-900	15	55	45
34CrMoS4	500	750-900	15	55	45
42CrMo4	550	800-950	13	50	35
42CrMoS4	550	800-950	13	50	35
34CrNiMo6	700	900-1000	12	55	45
30CrNiMo8	800	1000-1200	11	50	45

Steel designation Name	Mechanical properties for the ruling section (see EN 10083-1:2006, Annex A) with a diameter (d) or for flat products thickness (t) of
160 mm < d≤ 250 mm ,100 mm < t≤ 160 mm
	Re min.	Rm	A min	Z min	KV b min
	MPac	MPac	%	%	J
34CrMo4	450	700-850	15	60	45
34CrMoS4	450	700-850	15	60	45
42CrMo4	500	750-900	14	55	35
42CrMoS4	500	750-900	14	55	35
34CrNiMo6	600	800-950	13	55	45
30CrNiMo8	700	900-1100	12	50	45
a Re: Upper yield strength or, if no yield phenomenon occurs, 0,2 % proof strength Rp0,2. Rm: Tensile strength. A: Percentage elongation after fracture (initial gauge length Lo = 5,65 S0 see Table 10, column 7a, line T4). Z: Reduction in cross section on fracture. KV: Impact strength of longitudinal Charpy-V-notch test pieces (average of 3 individual values shall meet the minimum specified in the table; no individual value shall be lower than 70 % of the minimum shown in the table.)
b.For sampling see EN 10083-1:2006 fig.1 and fig.3
c 1 MPa = 1 N/mm2.
d For 40 mm < d≤ 60 mm and 20 mm < t≤ 40 mm.