Manganese-boron steels â€“ BILSTEIN CEE

SPECIAL GRADES

Manganese-boron steels

Manganese-boron steels are tempered boron-alloy steels. They are noted for the good formability and their excellent strength goods after heat treatment. This strength is caused by carbon and manganese content, as well as the low boron content, which is no more than a few thousandths of a percent.

Manganese-boron steels are used in press hardening, a process employed in the development of lightweight components, such as in the automotive industry. They are also increasingly used in a wide range of applications as a substitute for case-hardened and tempered steels, in line with DIN EN 10132. Compared to these grades, the strength of manganese-boron steels means the carbon content can be reduced, significantly in proving weldability.

The steels offer all the benefits of cold-rolled products, such as:

Strict thickness and width tolerances
Extremely consistent mechanical properties
Application-specific surfaces

PRODUCTS

Types of steel

Overview

Chemical properties

Mechanical properties

Short name	Material number	Thickness in mm^a	Width in mm^a	Thickness in inch^a	Width in inch^a	Coil	Spool^a	Bar^a	MA	MB^a	RN^a	RL	RM^a	RR^a
8MnCrB3	1.7135	0.1 - 12	5 - 650	0.004 - 0.468	0.195 - 25.35	•	•	•	•	•	•	•	•	•
17MnB3	1.5506	0.1 - 12	5 - 650	0.004 - 0.468	0.195 - 25.35	•	•	•	•	•	•	•	•	•
20MnB5	1.5530	0.1 - 12	5 - 650	0.004 - 0.468	0.195 - 25.35	•	•	•	•	•	•	•	•	•
22MnB5	1.5530	0.1 - 12	5 - 650	0.004 - 0.468	0.195 - 25.35	•	•	•	•	•	•	•	•	•
27MnCrB5-2	1.7182	0.1 - 12	5 - 650	0.004 - 0.468	0.195 - 25.35	•	•	•	•	•	•	•	•	•
30MnB5	1.5531	0.1 - 8	5 - 650	0.004 - 0.312	0.195 - 25.35	•	•	•	•	•	•	•	•	•
33MnCrB5-2	1.7185	0.1 - 8	5 - 650	0.004 - 0.312	0.195 - 25.35	•	•	•	•	•	•	•	•	•
37MnB5	1.5524	0.1 - 8	5 - 650	0.004 - 0.312	0.195 - 25.35	•	•	•	•	•	•	•	•	•
38MnB5	1.5532	0.1 - 8	5 - 650	0.004 - 0.312	0.195 - 25.35	•	•	•	•	•	•	•	•	•
39MnCrB6-2	1.7189	0.1 - 8	5 - 650	0.004 - 0.312	0.195 - 25.35	•	•	•	•	•	•	•	•	•

a = measured at the cross section

		Mass-share in %
Short name	Material number	C	Si max	Mn	P max	S max	Cr + Mo max	B	Cr
8MnCrB3	1.7135	0.06 - 0.11	0.40	0.70 - 1.00	0.025	0.025		0.0008 - 0.0040	0.25 - 0.50
17MnB3	1.5506	0.15 - 0.18	0.40	0.60 - 0.80	0.025	0.025		0.0008 - 0.0045	0.15 - 0.35
20MnB5	1.5530	0.17 - 0.23	0.40	1.10 - 1.40	0.025	0.025	- / -	0.0008 - 0.0050
22MnB5	1.5530	0.19 - 0.26	0.40	1.10 - 1.40	0.025	0.025		0.0008 - 0.0050	0.15 - 0.35
27MnCrB5-2	1.7182	0.24 - 0.30	0.40	1.10 - 1.40	0.025	0.025		0.0008 - 0.0050	0.30 - 0.60
30MnB5	1.5531	0.27 - 0.33	0.40	1.15 - 1.45	0.025	0.025		0.0008 - 0.0050
33MnCrB5-2	1.7185	0.30 - 0.36	0.40	1.20 - 1.50	0.025	0.025		0.0008 - 0.0050	0.30 - 0.60
37MnB5	1.5524	0.34 - 0.40	0.40	0.80 - 1.10	0.025	0.025		0.0008 - 0.0050	0.15 - 0.35
38MnB5	1.5532	0.36 - 0.42	0.40	1.15 - 1.45	0.025	0.025		0.0008 - 0.0050
39MnCrB6-2	1.7189	0.36 - 0.42	0.40	1.40 - 1.70	0.025	0.025		0.0008 - 0.0050	0.30 - 0.60

Short name	Material number	Condition	Rp _0,2 MPa max	Rm MPa	A₈₀% min	HV max
8MnCrB3	1.7135	+A ; +LC	300	410	24	115
17MnB3	1.5506	+A ; +LC	320	430	23	122
20MnB5	1.5530	+A ; +LC	340	470	22	135
22MnB5	1.5530	+A ; +LC	360	480	23	140
27MnCrB5-2	1.7182	+A ; +LC	380	530	20	160
30MnB5	1.5531	+A ; +LC	410	550	19	170
33MnCrB5-2	1.7185	+A ; +LC	450	580	16	175
37MnB5	1.5524	+A ; +LC	460	590	16	175
38MnB5	1.5532	+A ; +LC	430	550	18	170
39MnCrB6-2	1.7189	+A ; +LC	440	590	16	175