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Mat.No. 1.1170/DIN 28Mn6/AISI 1330

Manganese steel for moderate and lower temperature use in pressure vessels.
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  • Mat.No. 1.1170/DIN 28Mn6/AISI 1330

  • Osaka

Manganese steel for moderate and lower temperature use in pressure vessels. 

Designation by Standards

Mat. No. DIN EN AISI
1.1170 28Mn6 - 1330


Chemical Composition (in weight %)

C Si Mn Cr Mo Ni V W Others
0.28 max. 0.40 1.48 max. 0.40 max. 0.10 max. 0.40 - - (Cr+Mo+Ni)=max. 0.63


Applications
Used for weld fabrication of pressure vessels that require improved notch toughness for lower than ambient temperature service. Low and moderately stressed parts for vehicles, machines and engines. 

Physical properties (average values) at ambient temperature

Modulus of elasticity [103 x N/mm2]: 210  
Density [g/cm3]: 7.83

Soft Annealing
This will produce a maximum Brinell hardness of 223. 


Normalizing
Normalizing temperature: 850-890oC. 

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to approx. 650oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment. 


Hardening
Harden from a temperature of 830-870oC followed by water or oil quenching. 


Tempering

Tempering temperature: 540-680oC

Mechanical Properties in Normalized Condition

Diameter (mm) 0.2 % proof stress min.(N/mm2) Tensile strength min. (N/mm2) Elongation min.(%)
up to 16 345 630 17
17-40 310 680 18
41-100 290 590 18


Mechanical Properties in Quenched and Tempered Condition

Diameter (mm) 0.2 % proof stress min. (N/mm2) Tensile strength min. (N/mm2) Elongation min.(%) Reduction of area min. (%) Notch impact energy (ISO-V) min. (J)
up to 16 590 800-950 13 40 35
17-40 490 700-850 15 45 40
41-100 440 650-800 16 50 40
101-160 390 590-740 18 - -
161-250 390 590-740 18 - -
251-500 340 540-690 19 - -


Hardenability Diagram
Hardenability in the end-quench test
Quenching temperature in the end-quench test is 850oC

Hardness 1.5 3 5 7 9 11 13 15 20 25 30 35 40 45 50
H max. 54 53 51 48 44 41 38 35 31 29 27 26 25 25 24
H min. 45 42 37 27 21 - - - - - - - - - -
HH max. 54 53 51 48 44 41 38 35 31 29 27 26 25 25 24
HH min. 48 46 42 34 30 27 24 21 - - - - - - -
HL max. 51 49 46 41 35 32 29 22 20 - - - - - -
HL min. 45 42 37 27 21 - - - - - - - - - -


Forging
Hot forming temperature: 1050-850oC. 

Machinability
Machinability of this steel is good. 

Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as it becomes available.


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