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20MnCr5 - Nr.1.7147 20MnCrS5 - Nr.1.7149

High-Alloy Mn-Cr Steel for Large Components

Manganese and chromium steel with a content of alloy elements slightly higher than the previous type, suitable for large pieces.

Standard Reference: EN ISO 683-3: 2018 (Hot-rolled) | EN 10277: 2018 (Bright products)

EUROPE		ITALY	GERMANY		FRANCE	UK	USA
EN 10084: 2008 EN 10277-4: 2008		(UNI 7846-78)	(DIN 17210-84)		(NFA35-551-86)	(BS970 pt.1--96)	AISI/SAE
Grade	N°		Werkstoff	N°
20MnCr5	1.7147	20MnCr5	20MnCrS5	1.7149	20MC5	-	5120
20MnCrS5	1.7149				20MC5	-	5120

EUROPE	C	Si	Mn	P/max	S	Cr	Cu/max	Al	Pb
20MnCr5	0,17÷0,22	0,15÷0,40	1,10÷1,40	0,025	≤0,035	1,00÷1,30	0,40	0,020÷0,050	-
20MnCrS5					0,020÷0,040				-
20MnCrS5Pb					0,020÷0,040				0,15÷0,30

Hardness (HB) Treated to improve sherability (+S)	Hardness (HB) Annealed to maximum hardness requirements (+A)			Hardness (HB) Treated to hardness range (+TH)			Hardness (HB) Treated to ferrite-pearlite structure and hardness range (+FP)		Hardness (HB) Normalized (+N)
( ≤ 255 )	≤ 217			≥ 170		≤ 217	≥ 152	≤ 201	140 ÷201

Size (mm)	+A*+ Turned (+A +SH)	+A*+ Cold drawn (+A+C)	FP**+ Turned (+FP +SH)	FP**+ Cold drawn (+FP +C)
Size (mm)	Hardness HB max	Hardness HB max	Hardness HB	Hardness HB
5≤d≤10	-	270	-	-
10<d≤16	-	260	-	-
16<d≤40	217	255	152÷201	152÷250
40<d≤63	217	250	152÷201	152÷245
63<d≤100	217	250	152÷201	152÷245
+A = annealed to maximum hardness requirement. *+FP = treated to ferrite-perlite structure and hardness range. Note: For size <5 mm the mechanical properties may be agreed at the time of enquiry and order.

Limits of range		Hardness HRC at a distance from quenched end of test pieces (mm)
Limits of range		1,5	3	5	7	9	11	13	15	20	25	30	35	40
+H	Max	49	49	48	46	43	42	41	39	37	35	34	33	32
+H	Min	41	39	36	33	30	28	26	25	23	21	-	-	-
+HH	Max	49	49	48	46	43	42	41	39	37	35	34	33	32
+HH	Min	44	42	40	37	34	33	31	30	28	26	25	24	23
+HL	Max	46	46	44	42	39	37	36	34	32	30	29	28	27
+HL	Min	41	39	36	33	30	28	26	25	23	21	-	-	-