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 Technical Details

Know About Wear

Wear is the Loss or Deterioration of thickness on industrial Equipments, due to the friction of Minerals, Cement, Slag, Urban Waste etc. in Coal Power Stations, Cement factories, Mining, Fertilizer Industries etc.

Causes of Wear

Causes of Wear FRICTION: Rubbing between two surfaces Fricci.jpg (5033 bytes)
ABRASION: Removal of particles Abrasion
IMPACT:Cracks and breaks Impact
Other Causes HEAT: Reduction of hardness Thermameter
CHEMICAL: Deterioration of microscopic structure Chemistry


Un Alloyed Iron

Cast Iron

Guidelines by BMW Steels Ltd. for WEAR RESISTANCE
Cast Iron Slide
SLIDING		 Fricci.jpg (5033 bytes)
FRICTION		 Abrasion
ABRASION		 Impact
IMPACT**		 Thermameter
HEAT		 Chemistry
CHEMICAL
as per
ASTM-A48
Class 20-60		 High Low
coefficient		 0.9 to 1 times* High ** Medium
500 °C		 -
*In Comparison with Mild Steel: 1 time 
**ANGLE OF INCIDENCE - maximum recommendable -
depending on particle size of product being worn
Guidelines by BMW Steels Ltd. for WEAR RESISTANCE for guidance only, having been produced - after selection
of the product most appropriate to ORIGIN OF WEAR: Abrasion, Impact, Heat, Chemical, etc.-
from data obtained on visits to Factories.


HARDNESS ANALYSIS         (%) DENSITY
C Si Mn S P Ni Cr V Ti
180 BHN 2.8 - 3.3 1 - 2 1 MAX 0.08 MAX 0.25 MAX TRACES TRACES - - 7.7 gm/cm³

    Thickness minimum 12 mm.

Mild Steel

Guidelines by BMW Steels Ltd. for WEAR RESISTANCE
Mild
Steel 		Slide
SLIDING		 Fricci.jpg (5033 bytes)
FRICTION		 Abrasion
ABRASION		 Impact
IMPACT**		 Thermameter
HEAT		 Chemistry
CHEMICAL
as per
ASTM-A201
Grade A,B & C		 Low Low
coefficient		 1 times* Very High**
 Low
300 °C		 -
*In Comparison with Mild Steel: 1 time 
**ANGLE OF INCIDENCE - maximum recommendable -
depending on particle size of product being worn
Guidelines by BMW Steels Ltd. for WEAR RESISTANCE for guidance only, having been produced - after selection
of the product most appropriate to ORIGIN OF WEAR: Abrasion, Impact, Heat, Chemical, etc.-
from data obtained on visits to Factories.


HARDNESS ANALYSIS         (%) DENSITY
C Si Mn S P Ni Cr V Ti
180 BHN 0.3 MAX 0.75 MAX 0.5 - 1.5 0.06 0.06 TRACES TRACES - - 7.8 gm/cm³

    Thickness minimum 6mm.

Alloyed Iron

Chrome Steel

Guidelines by BMW Steels Ltd. for WEAR RESISTANCE
Chrome 
Steel
 Slide
SLIDING		 Fricci.jpg (5033 bytes)
FRICTION		 Abrasion
ABRASION		 Impact
IMPACT**		 Thermameter
HEAT		 Chemistry
CHEMICAL
as per
IS 4896		 Low
 Low
coefficient
 4 - 6 times*  High**
 Low
200 °C		 Low
*In Comparison with Mild Steel: 1 time 
**ANGLE OF INCIDENCE - maximum recommendable -
depending on particle size of product being worn
Guidelines by BMW Steels Ltd. for WEAR RESISTANCE for guidance only, having been produced - after selection
of the product most appropriate to ORIGIN OF WEAR: Abrasion, Impact, Heat, Chemical, etc.-
from data obtained on visits to Factories.


HARDNESS ANALYSIS         (%) DENSITY
C Si Mn S P Ni Cr V Ti
350 BHN 0.45 - 0.65 0.75 MAX 0.5 - 1 0.06 0.06 TRACES 0.8 - 1.5 - - 7.8 gm/cm³

    Thickness minimum 16 mm.

Ni Hard

Guidelines by BMW Steels Ltd. for WEAR RESISTANCE
Ni-Hard
 Slide
SLIDING		 Fricci.jpg (5033 bytes)
FRICTION		 Abrasion
ABRASION		 Impact
IMPACT**		 Thermameter
HEAT		 Chemistry
CHEMICAL
as per
IS 4771		 Medium
 Low
coefficient
 10 - 12 times*  Medium**
 550 °C -
*In Comparison with Mild Steel: 1 time 
**ANGLE OF INCIDENCE - maximum recommendable -
depending on particle size of product being worn
Guidelines by BMW Steels Ltd. for WEAR RESISTANCE for guidance only, having been produced - after selection
of the product most appropriate to ORIGIN OF WEAR: Abrasion, Impact, Heat, Chemical, etc.-
from data obtained on visits to Factories.


HARDNESS ANALYSIS         (%) DENSITY
C Si Mn S P Ni Cr Mo Ti
550 BHN 2.7 - 3.3 1.5 - 2.2 0.3 - 0.6 0.15 MAX 0.3 MAX 4 - 6 8 - 10 0.5 MAX - 7.9 gm/cm³

Thickness minimum 20mm.

Ceramics

Basalt

Guidelines by BMW Steels Ltd. for WEAR RESISTANCE
Basalt
 Slide
SLIDING		 Fricci.jpg (5033 bytes)
FRICTION		 Abrasion
ABRASION		 Impact
IMPACT**		 Thermameter
HEAT		 Chemistry
CHEMICAL
Cast Basalt High
 Low
coefficient
 15 - 20 times*  Low**
 350 °C High
*In Comparison with Mild Steel: 1 time 
**ANGLE OF INCIDENCE - maximum recommendable -
depending on particle size of product being worn
Guidelines by BMW Steels Ltd. for WEAR RESISTANCE for guidance only, having been produced - after selection
of the product most appropriate to ORIGIN OF WEAR: Abrasion, Impact, Heat, Chemical, etc.-
from data obtained on visits to Factories.


HARDNESS ANALYSIS         (%) DENSITY
Al2O3 SiO2 Fe2O3 / FeO CaO MgO K2O Na2O TiO2
7 - 8 MOH 14 50 12 12 10 4 4 3 3 gm/cm³

    Thickness minimum 20 mm.

Alumina

Guidelines by BMW Steels Ltd. for WEAR RESISTANCE
Alumina
 Slide
SLIDING		 Fricci.jpg (5033 bytes)
FRICTION		 Abrasion
ABRASION		 Impact
IMPACT**		 Thermameter
HEAT		 Chemistry
CHEMICAL
Sintered Alumina Ceramic Very High
 Low
coefficient
 25 - 30 times*  Medium**
 1000 °C High
*In Comparison with Mild Steel: 1 time 
**ANGLE OF INCIDENCE - maximum recommendable -
depending on particle size of product being worn
Guidelines by BMW Steels Ltd. for WEAR RESISTANCE for guidance only, having been produced - after selection
of the product most appropriate to ORIGIN OF WEAR: Abrasion, Impact, Heat, Chemical, etc.-
from data obtained on visits to Factories.


HARDNESS ANALYSIS DENSITY COLOUR
08 - 09 MOH Al 2O3  87 - 90 % 3.2 - 3.4 gm/cm³ White

Thickness minimum 10 mm. for mortar fixed and 15 mm for weld on tiles.

CBC

Guidelines by BMW Steels Ltd. for WEAR RESISTANCE
CBC
 Slide
SLIDING		 Fricci.jpg (5033 bytes)
FRICTION		 Abrasion
ABRASION		 Impact
IMPACT**		 Thermameter
HEAT		 Chemistry
CHEMICAL
Chemically Bonded Ceramics Very High
 Low
coefficient
 15 - 20 times* Medium**
 1200 °C High***
*In Comparison with Mild Steel: 1 time 
*** for chlorides & sulphides
**ANGLE OF INCIDENCE - maximum recommendable -
depending on particle size of product being worn
Guidelines by BMW Steels Ltd. for WEAR RESISTANCE for guidance only, having been produced - after selection
of the product most appropriate to ORIGIN OF WEAR: Abrasion, Impact, Heat, Chemical, etc.-
from data obtained on visits to Factories.


HARDNESS Compressive Strength DENSITY Fraction Energy
07 - 08 MOH 1200 Kg / cm² 2.5 - 2.9 gm / cm³ 15,000 J / m²

    Thickness minimum 05mm.




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