Mill Liner Alloy Specifications
FC Mill Liners casts custom mill liners in three alloy lines: FC DuraPro™ pearlitic chrome-molybdenum steel, FC WearPro™ martensitic tool steel and FC ProLiner™ martensitic white iron. All are produced to ASM or ASTM international specifications, with surface hardness from 300 BHN to 610 BHN minimum.
Below is the nominal chemistry and hardness for all seven standard grades. Standard grades are selected based on each customer’s needs and can be customized for specific applications and challenges.
Mill Liner Alloys at a Glance
FC DuraPro™
300–420 BHN
- Grades
- FCA-11, FCA-12, FCA-13
- Equivalent standard
- ASM Low C, Med C, Hi C
- Properties
- Best impact toughness, superior abrasion resistance
- Typical use
- High-impact environments: SAG, rod and ball mill shell liners, end liners, lifter bars, grates, pulp lifters and dischargers
FC WearPro™
510–550 BHN
- Grade
- FCA-21
- Equivalent standard
- ASTM A597 CH-12
- Properties
- Good corrosion and abrasion resistance, good impact toughness
- Typical use
- SAG feed and discharge end liners, chute liners
FC ProLiner™
610 BHN min
- Grades
- FCA-31, FCA-32, FCA-33
- Equivalent standard
- ASTM A532 Class II B, Class III A
- Properties
- Excellent abrasion resistance, good corrosion resistance, medium impact toughness
- Typical use
- High sliding-abrasion environments: autogenous, rod and ball mill shell liners, end liners, lifter bars, grates, pulp lifters and dischargers
Surface Brinell Hardness by Grade
Harder grades resist abrasion. Softer, tougher grades absorb impact. The chart shows each standard grade’s surface hardness range on the same scale.
Nominal Chemical Composition
Composition in weight percent, as published in the FC Mill Liners Materials Data Sheets.
FC DuraPro™ Mill Liners
Pearlitic Chrome-Molybdenum Steel
FC DuraPro™ pearlitic chrome-molybdenum steels are produced to ASM international specifications and offer superior abrasion resistance and the best impact toughness. Typical applications include high-impact environments such as SAG, rod and ball mill shell liners, feed end liners, discharge end liners, lifter bars, grates, filler rings, filler blocks, pulp lifters and dischargers.
| Grade | FCA-11 | FCA-12 | FCA-13 |
|---|---|---|---|
| Equivalent standard | ASM Low C | ASM Med C | ASM Hi C |
| Composition (weight %) | |||
| Carbon | 0.60 | 0.70 | 0.80 |
| Manganese | 0.75 | 0.75 | 0.75 |
| Silicon | 0.50 | 0.50 | 0.50 |
| Chromium | 2.25 | 2.25 | 2.25 |
| Nickel | 0.2 max | 0.2 max | 0.2 max |
| Molybdenum | 0.35 | 0.35 | 0.35 |
| Phosphorus | 0.03 max | 0.03 max | 0.03 max |
| Sulphur | 0.03 max | 0.03 max | 0.03 max |
| Surface Brinell Hardness (BHN) | 300–370 | 310–400 | 330–420 |
FC WearPro™ Mill Liners
Martensitic Tool Steel
FC WearPro™ martensitic tool steel is produced to ASTM international specifications and offers good corrosion and abrasion resistance while maintaining good impact toughness. Typical applications include SAG feed and discharge end liners and chute liners. In certain SAG applications, WearPro™ can be substituted for chrome-molybdenum steel to increase component wear life.
| Grade | FCA-21 |
|---|---|
| Equivalent standard | ASTM A597 CH-12 |
| Composition (weight %) | |
| Carbon | 0.35 |
| Manganese | 0.38 |
| Silicon | 0.75 |
| Chromium | 5.25 |
| Molybdenum | 1.50 |
| Phosphorus | 0.03 max |
| Sulphur | 0.03 max |
| Surface Brinell Hardness (BHN) | 510–550 |
FC ProLiner™ Mill Liners
Martensitic White Irons
FC ProLiner™ martensitic white irons are produced to ASTM international specifications and offer good corrosion and excellent abrasion resistance while offering medium impact toughness. Typical applications include high sliding-abrasion environments such as autogenous, rod and ball mill shell liners, feed end liners, discharge end liners, lifter bars, grates, filler rings, filler blocks, pulp lifters and dischargers.
| Grade | FCA-31 | FCA-32 | FCA-33 |
|---|---|---|---|
| Equivalent standard | ASTM A532 Class II B | ASTM A532 Class II B | ASTM A532 Class III A |
| Composition (weight %) | |||
| Carbon | 2.65 | 2.65 | 2.65 |
| Manganese | 1.00 | 0.75 | 2.00 max |
| Silicon | 0.75 | 0.55 | 1.50 max |
| Chromium | 16.00 | 16.00 | 27.00 |
| Nickel | 1.25 | 1.25 | 2.50 max |
| Molybdenum | 1.50 | 2.80 | 3.00 max |
| Phosphorus | 0.10 max | 0.10 max | 0.10 max |
| Sulphur | 0.06 max | 0.06 max | 0.06 max |
| Copper | 0.60 | – | 1.20 max |
| Surface Brinell Hardness (BHN) | 610 min | 610 min | 610 min |
Standard FCA alloy grades are selected based on each customer’s needs and can be customized to meet specific applications and challenges.
Frequently Asked Questions
What is the hardness of FC Mill Liners’ alloys?
Surface Brinell hardness ranges from 300–370 BHN for FC DuraPro™ FCA-11 up to 330–420 BHN for FCA-13. FC WearPro™ FCA-21 is 510–550 BHN, and all three FC ProLiner™ grades are 610 BHN minimum.
Which alloy has the best impact toughness?
FC DuraPro™ pearlitic chrome-molybdenum steel offers the best impact toughness of our alloy lines. It is typically used in high-impact environments such as SAG mill shell liners.
Which alloy is best for high-abrasion applications?
FC ProLiner™ martensitic white iron (ASTM A532) offers excellent abrasion resistance at 610 BHN minimum. It is typically used where sliding abrasion dominates, such as autogenous, rod and ball mill shell liners.
Can these alloy grades be customized?
Yes. Standard FCA grades are selected based on each customer’s needs and can be customized to meet specific applications and challenges.
Which mill liner components do you cast?
Shell liners, feed end liners, discharge end liners, lifter bars, grates, filler rings, filler blocks, pulp lifters, dischargers and chute liners, for AG, SAG, ball and rod mills.
Download the Data Sheets
Not Sure Which Alloy Fits Your Mill?
Our engineers select and adjust the alloy grade based on your mill type, ore and operating conditions. Ask for a no-cost, no-obligation application design analysis.