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Some of the names used in our website are trade names and/or trademarks of specific manufacturers. CHAMPAK INDUSTRIES is not affiliated with any manufacturer(s). Supplies would be made to meet customer specifications from any of the available source(s). Trade names or Trademarks have been used solely for reference purpose and to help customers identify products consistent with listed specifications.

  • Inconel, Incoloy and Monel are registered trademarks of special Metals Group of Companies.
  • Hastelloy is a registered trademark of Haynes International.
  • 254 SMO is a trademark owned by Outokumpu Stainless.
  • Hardox is registered trademark of SSAB.
  • Sanicro 28 is a registered trademark of Sandvik AB.

 

 

 

 

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12-14% Manganese (12-14% MN)

Standard

CREUSABRO® M / X120 Mn12 / 12-14% Manganese

A high manganese, fully austenitic, quench annealed, non magnetic, work-hardening steel with an exceptionally high level of wear resistance when subjected to work-hardening by shock or high impact pressure in service.

The main characteristics of manganese plate is a superior wear resistance:

Severe wear on the surface has a work-hardening effect on the austenitic structure of this steel. 

This, when combined with the level of carbon in accordance with the international standards, leads

to an increase in hardness from 200BHN (in as delivered plate) up to an in-service hardness of at

least 600BHN.

This work-hardening capability renews itself through out in-service life.  The underlayers not work-hardened maintain an excellent resistance to shock and a very high ductility.

Chemical Analysis Typical values (% weight)

C

Si

Mn

S

1.15

0.40

13

≤0.002

Processing

12-14% MN grade is processed by usual methods taking into account its special properties:  specifically its aptitude for work-hardening, high coefficient of expansion, and low thermal conductivity.



Cutting

 Thermal Cutting: possible using oxy-acetylene with iron powder addition or improved using plasma or laser cutting which result in a  cleaner quality of cut.
Mechanical Cutting: shearing can be easily achieved with sufficiently powerful machines and freshly sharpened blades.  When cross-cutting is necessary, intermediate local grinding is required on edges (already work-hardened).

Machining

By standard methods allowing for work-hardening : the edges of the tool should bite beyond the work-hardened zones, necessitating a rigid machine.

Drilling: 

using supercarburized cobalt alloy high speed steel bits of HSSCO type (AFNOR grade 2-9-1-8, AISI grade M42), with reinforced shape, 130° point angle, long twist, low cutting speed (2 – 3m/min.), high feed, lubrication using soluble oils. The depth of the hole to be drilled should not exceed 3 times the bit diameter. (Other solutions: 3 nibbed bits with carbide reinforcement, concrete drill bits, hot drilling).

Milling

using supercarburized high speed steel tools of HSSCO type (AISI grade M42) or carbide tipped tools (ISO grade K10) and high feed (as for drilling) to bite beyond work hardened zones.Punching is possible on sufficiently powerful equipment and with tools in good condition(avoid denting shocks).

Forming

Bending and rolling are easy: to be performed cold only (at workshop temperature).  Avoid forming directly on zones previously work-hardened (e.g. sheared edges), carry out grinding of these areas.

Welding

Using standard procedures taking into account : high coefficient of expansion, low thermal

conductivity, risk of carbide precipitation above 300°C (572°F).

Weld Metal: 

Heterogeneous welds  (most common practice):

For manual arc welding typical deposits recommended are 18Cr8Ni6Mn or 20Cr10Ni3Mo(class A5.4E307 or 5.4E308Mo per AWS). For semi-automatic welding under gas the same type of deposit is used in

- solid wire – class A5.2ER 307 or A5.9ER 308 Mo per AWS

- coated wire – class A5.22E 307T or A5.22E 308 Mo T per AWS

Homogeneous welds  (work-hardenable deposit)

Typical deposit 12Mn3NiMo (class A5.13E  FeMn per AWS) for manual welding.

For semi-automatic welding coated wire of similar composition, with or without protective gas.

 

General Recommendations:

Welding is performed with low heat-input E,20KJ/cm, interpass temperature limited to ≅ 100°C(212°F) with water-cooling, if necessary between each pass.  Any distortion can be hammered out.

N.B. NEVER PREHEAT

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