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

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

Designation by Standards

Chemical Composition (in weight %)

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: 850-890^oC. 

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to approx. 650^oC, 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 830-870^oC followed by water or oil quenching. 

Tempering
Tempering temperature: 540-680^oC

Mechanical Properties in Normalized Condition

Mechanical Properties in Quenched and Tempered Condition

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

Forging
Hot forming temperature: 1050-850^oC. 

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.