Steel A532 Class III Type A
ASTM A532 Class III Type A · GB KmTBCr26
ASTM A532 Class III Type A is a high-chromium white cast iron (Cr26 class, also GX300CrMo15-3 and KmTBCr26) with chromium carbides in a martensitic matrix.
Reference datasheet — A532 Class III Type A is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the HT condition
A532 Class III Type A tempers and conditions
A532 Class III Type A is supplied in 5 conditions, soft to hard. HT is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Softened (soft annealed) for machining, 400 HB max | Pick when the casting must be drilled, turned or bored before final hardening; wear resistance in this state is poor. | — | 420 | 0.5 | 41 HRC | — |
Spheroidize annealed | Lowest-cost condition; adequate for many liners and pump parts where as-cast 600 HB minimum is sufficient. | — | 480 | 0 | 60 HRC | — |
As-cast and stress-relieved | As-cast parts given a subcritical stress-relief to reduce casting-stress cracking in thick or complex sections. | — | 500 | 0 | 60 HRC | 1.7 % IACS |
HTDefault Hardened | Standard supply condition for demanding abrasion service — maximum matrix martensite and peak hardness (≥600 HB). | — | 550 | 0 | 64 HRC | — |
Hardened and stress-relieved | Choose for thick or impact-loaded wear parts: a subcritical temper trades a few HB for lower residual stress and better crack resistance. | — | 570 | 0 | 62 HRC | 1.9 % IACS |
What is A532 Class III Type A?
ASTM A532 Class III Type A is a high-chromium white cast iron (Cr26 class, also GX300CrMo15-3 and KmTBCr26) with chromium carbides in a martensitic matrix. Heat treated it reaches 680 HB (64 HRC) with 550 MPa tensile strength and no measurable elongation, giving the longest abrasion life in the white-iron family plus useful resistance to mildly corrosive slurries and service to 600 °C. Parts are cast to near net shape because machinability is effectively nil (score 2); Ni-Hard Class I Type A is the cheaper choice where corrosion is not a factor. A532 Class III Type A has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 97% of steel grades. It melts at 1,230°C (2,246 °F). A532 Class III Type A has a tensile strength of 550 MPa (79.8 ksi), weaker than 69% of steel grades. Elongation at break is 0% and the elastic modulus is 210 GPa (30.5 Msi).
What is A532 Class III Type A used for?
- slurry pumps
- mill liners
- dredge pump parts
- coal pulverizer components
Advantages
- High service temperature — 600°C (1,112 °F), better than 98% of steel grades
- Good corrosion resistance — 40/100, better than 98% of steel grades
Limitations
- Limited ductility — 0%, worse than 100% of steel grades
- Difficult to machine — 2/100, worse than 100% of steel grades
- Limited formability — 2/100, worse than 100% of steel grades
- Difficult to weld — 8/100, worse than 99% of steel grades
- Low fracture toughness — 25 MPa·√m (22.8 ksi·√in), worse than 97% of steel grades
A532 Class III Type A properties
Typical room-temperature values for A532 Class III Type A-HT; bars are the position among steel grades.
Physical3
A532 Class III Type A has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 97% of steel grades. It melts at 1,230°C (2,246 °F).
Mechanical13
A532 Class III Type A has a tensile strength of 550 MPa (79.8 ksi), weaker than 69% of steel grades. Elongation at break is 0% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
A532 Class III Type A is rated for continuous service to 600°C (1,112 °F). It conducts heat at 20 W/m·K (11.6 BTU/hr·ft·°F), worse than 96% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical2
A532 Class III Type A has an electrical resistivity of 9×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is fair (40/100), better than 98% of steel grades.
Sustainability4
Producing a kilogram of A532 Class III Type A takes about 28 MJ of energy and emits 2.4 kg of CO₂ — less than 56% of steel grades. Typical recycled content is 65%.
Manufacturability8
A532 Class III Type A's machinability is not recommended (2/100, worse than 100% of steel grades); weldability not recommended (8/100); formability not recommended (2/100).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. A532 Class III Type A is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A532 Class III Type A
Is A532 Class III Type A easy to machine?
In the hardened state only grinding, EDM or CBN/ceramic cutting is practical; do any drilling or turning in the softened (≤400 HB) condition and re-harden afterwards.
Can A532 Class III Type A be welded?
Not a weldable structural material — repair or hardfacing overlay only, with 250–400 °C preheat, austenitic Ni or high-Cr electrodes and slow cooling to limit cracking.
Can A532 Class III Type A be formed, bent or molded?
Sand/shell casting to near-net shape with generous feeders and controlled section change; no forging, rolling or cold forming is possible.
A532 Class III Type A chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | 2 – 3.3 | 2.8 |
| Mn | ≤ 2 | 0.8 |
| Si | ≤ 1.5 | 0.7 |
| Ni | ≤ 1.5 | 0.3 |
| Cr | 23 – 30 | 26 |
| Momax; added for hardenability in heavy sections | ≤ 3 | 1 |
| Cu | ≤ 1.2 | 0.3 |
| P | ≤ 0.1 | 0.04 |
| S | ≤ 0.06 | 0.03 |
| Fe | balance | — |
What surface finishes work on A532 Class III Type A?
Normally used bare as a wear face; surfaces are ground or shot-blasted, and non-wear faces can be painted for storage/transport corrosion protection.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel A532 Class III Type A in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- KmTBCr26
- Similar grades
- GX300CrMo15-3Cr26
How much does A532 Class III Type A cost?
A532 Class III Type A is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
A532 Class III Type A — frequently asked
What is A532 Class III Type A used for?
A532 Class III Type A is typically used for slurry pumps, mill liners, dredge pump parts and coal pulverizer components. In short: hardest white iron grade; abrasion plus mild corrosion; 600 °C wear service.
What is the tensile strength of A532 Class III Type A?
A532 Class III Type A has a typical tensile strength of 550 MPa (79.8 ksi) — weaker than 69% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is A532 Class III Type A easy to machine?
Not especially — machinability is rated not recommended (2/100, worse than 100% of steel grades). In the hardened state only grinding, EDM or CBN/ceramic cutting is practical; do any drilling or turning in the softened (≤400 HB) condition and re-harden afterwards.
Can A532 Class III Type A be welded?
Not readily — weldability is rated not recommended (8/100). Not a weldable structural material — repair or hardfacing overlay only, with 250–400 °C preheat, austenitic Ni or high-Cr electrodes and slow cooling to limit cracking.
What surface finishes work on A532 Class III Type A?
Normally used bare as a wear face; surfaces are ground or shot-blasted, and non-wear faces can be painted for storage/transport corrosion protection.
Can A532 Class III Type A be formed, bent or molded?
Sand/shell casting to near-net shape with generous feeders and controlled section change; no forging, rolling or cold forming is possible.
What is the maximum service temperature of A532 Class III Type A?
A532 Class III Type A is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does A532 Class III Type A cost?
A532 Class III Type A is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A532/A532M Standard Specification for Abrasion-Resistant Cast Irons — ASTM International (2019)
- GB/T 8263 (KmTBCr26) — SAC (2010)
- EN 12513 Founding — Abrasion resistant cast irons (GX300CrMo15-3 / GX260Cr27) — CEN (2011)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Abrasion-Resistant Cast Irons) — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- High-chrome white iron wear casting datasheets (mill liners, slurry pump parts) — Various foundries (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.