Steel A47 32510-M5003
Heat-treated state
ASTM A47 32510 · EN EN-GJMB-350-10 · JIS FCMB35 · GB KTH350-10
Use for higher static strength and better wear resistance than ferritic grades while keeping good machinability.
Values for the M5003 condition
Other A47 32510 tempers and conditions
A47 32510 is listed in 8 conditions; see the grade overview at A47 32510.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
annealed ferritic malleable iron, 32 ksi yield (ASTM A602) | Automotive-specification equivalent of A47 32510: annealed ferritic, specified by hardness for low-stress machined parts. | 230 | 360 | 12 | 130 HB | 51 W/m·K |
32510Default Annealed ferritic (blackheart) malleable iron, 32.5 ksi yield / 10 %… | Standard stocked condition: two-stage graphitizing anneal for maximum machinability and 10 % ductility in pipe fittings, brackets and hardware. | 240 | 360 | 12 | 130 HB | 51 W/m·K |
Annealed ferritic malleable iron, 35 ksi yield / 18 % elong | Pick when higher ductility/toughness is needed for cold-formed or bent-in-service parts (clips, chain links, ties). | 250 | 380 | 20 | 130 HB | 51 W/m·K |
air-quenched and tempered pearlitic malleable iron, 45 ksi yield / 4 % elong. | Lowest-strength pearlitic grade: pick when moderate strength plus easy machining and some ductility are needed (levers, brackets). | 320 | 460 | 5 | 190 HB | 46 W/m·K |
M5003This page air-quenched and tempered pearlitic malleable iron, 50 ksi yield / 3 % elong. | Use for higher static strength and better wear resistance than ferritic grades while keeping good machinability. | 355 | 530 | 4 | 210 HB | 46 W/m·K |
liquid-quenched and tempered malleable iron, 55 ksi yield / 3 % elong. | Oil-quenched tempered-martensite grade for higher yield strength at the same hardness band as M5003. | 390 | 530 | 4 | 210 HB | 46 W/m·K |
liquid-quenched and tempered malleable iron, 70 ksi yield / 2 % elong. | High-strength quenched-and-tempered grade for loaded automotive parts (steering arms, connecting links) where 2 % ductility suffices. | 495 | 630 | 3 | 24 HRC | 46 W/m·K |
liquid-quenched and tempered malleable iron, 85 ksi yield / 1 % elong. | Highest-strength, hardest malleable grade for wear-loaded gears/cams; essentially no ductility reserve, machine before or with carbide tooling. | 600 | 730 | 2 | 29 HRC | 45 W/m·K |
What is A47 32510-M5003?
A47 32510-M5003 is A47 32510 heat treated to M5003 — use for higher static strength and better wear resistance than ferritic grades while keeping good machinability. A47 32510-M5003 has a yield strength of 355 MPa (51.5 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 73% of steel grades. Elongation at break is 4% and the elastic modulus is 170 GPa (24.7 Msi). A47 32510-M5003 has a density of 7.3 g/cm³ (0.264 lb/in³), lighter than 98% of steel grades. It melts at 1,130°C (2,066 °F). 32510 is the default condition FabDigit quotes; M5003 is available on request or by drawing note.
Advantages
- Low embodied carbon — 1.6 kg CO₂/kg, better than 100% of steel grades
- Easy to machine — 75/100, better than 97% of steel grades
Limitations
- Limited ductility — 4%, worse than 98% of steel grades
- Low stiffness — 170 GPa (24.7 Msi), worse than 97% of steel grades
- Limited formability — 10/100, worse than 95% of steel grades
- Low fracture toughness — 45 MPa·√m (41 ksi·√in), worse than 90% of steel grades
- Difficult to weld — 20/100, worse than 84% of steel grades
A47 32510-M5003 properties
Typical room-temperature values for A47 32510-M5003; 12 are specific to this condition. Other listed values are A47 32510 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A47 32510-M5003 has a density of 7.3 g/cm³ (0.264 lb/in³), lighter than 98% of steel grades. It melts at 1,130°C (2,066 °F).
Mechanical15
A47 32510-M5003 has a yield strength of 355 MPa (51.5 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 73% of steel grades. Elongation at break is 4% and the elastic modulus is 170 GPa (24.7 Msi).
Thermal6
A47 32510-M5003 is rated for continuous service to 425°C (797 °F). It conducts heat at 46 W/m·K (26.6 BTU/hr·ft·°F), better than 71% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
A47 32510-M5003 conducts electricity at 5.5 % IACS, worse than 81% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of A47 32510-M5003 takes about 19 MJ of energy and emits 1.6 kg of CO₂ — less than 100% of steel grades. Typical recycled content is 85%.
Manufacturability8
A47 32510-M5003's machinability is very good (75/100, better than 97% of steel grades); weldability poor (20/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A47 32510-M5003
Is A47 32510 easy to machine?
One of the best-machining ferrous materials in the annealed state — temper carbon breaks chips; HSS works, use carbide and lower speeds above 200 HB (M7002/M8501).
Can A47 32510 be welded?
Not recommended for structural joints: HAZ forms carbide/martensite and cracks; if unavoidable, preheat 300–400 °C, use Ni-based electrodes and re-anneal/stress relieve.
Can A47 32510 be formed, bent or molded?
Green-sand or shell-mold cast as white iron with chilled thin sections (typically <25 mm), then two-stage graphitizing anneal (~900 °C hold + slow cool through eutectoid); pearlitic grades are air- or oil-quenched and tempered afterwards.
What surface finishes work on A47 32510?
Shot-blast the anneal scale, then hot-dip galvanize (standard for pipe fittings), zinc/phosphate, e-coat or paint; anodizing not applicable and high-polish finishes are limited by temper-carbon pull-out.
A47 32510 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 |
|---|---|---|
| Ctotal carbon; present as temper carbon after anneal | 2.2 – 2.9 | 2.5 |
| Sigraphitizer, controls anneal time | 0.9 – 1.9 | 1.4 |
| Mn | 0.15 – 1.25 | 0.4 |
| S | ≤ 0.2 | 0.09 |
| P | ≤ 0.18 | 0.06 |
| Crkept low to avoid stable carbide | ≤ 0.06 | 0.03 |
| FeASTM A47 sets properties, not chemistry; values are typical foundry practice | balance | — |
A47 32510-M5003 — frequently asked
What is A47 32510-M5003 used for?
A47 32510-M5003 is typically used for automotive suspension brackets, steering components, pipe fittings and hand tools. In short: best-machining cast iron; ductile at low cost; galvanizes readily.
What is the yield strength of A47 32510-M5003?
A47 32510-M5003 has a typical yield strength of 355 MPa (51.5 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 73% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is A47 32510-M5003 easy to machine?
Yes — machinability is rated very good (75/100, better than 97% of steel grades). One of the best-machining ferrous materials in the annealed state — temper carbon breaks chips; HSS works, use carbide and lower speeds above 200 HB (M7002/M8501).
Can A47 32510-M5003 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for structural joints: HAZ forms carbide/martensite and cracks; if unavoidable, preheat 300–400 °C, use Ni-based electrodes and re-anneal/stress relieve.
What surface finishes work on A47 32510-M5003?
Shot-blast the anneal scale, then hot-dip galvanize (standard for pipe fittings), zinc/phosphate, e-coat or paint; anodizing not applicable and high-polish finishes are limited by temper-carbon pull-out.
Can A47 32510-M5003 be formed, bent or molded?
Green-sand or shell-mold cast as white iron with chilled thin sections (typically <25 mm), then two-stage graphitizing anneal (~900 °C hold + slow cool through eutectoid); pearlitic grades are air- or oil-quenched and tempered afterwards.
What is the maximum service temperature of A47 32510-M5003?
A47 32510-M5003 is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A47 32510 32510 and A47 32510-M8501?
32510 is the default condition — standard stocked condition: two-stage graphitizing anneal for maximum machinability and 10 % ductility in pipe fittings, brackets and hardware. M8501: highest-strength, hardest malleable grade for wear-loaded gears/cams; essentially no ductility reserve, machine before or with carbide tooling. Yield strength is 240 MPa in 32510 versus 600 MPa in M8501.
Sources
- ASTM A47/A47M — Ferritic Malleable Iron Castings — ASTM International (2018)
- ASTM A602 — Automotive Malleable Iron Castings — ASTM International (2019)
- GB/T 9440 — (KTH350-10) — SAC (2010)
- EN 1562 — Founding: Malleable cast irons (EN-GJMB-350-10) — CEN (2019)
- ASM Handbook Vol.1: Properties and Selection — Malleable Iron — ASM International (1990)
- Machinery's Handbook — machinability ratings of cast irons — Industrial Press (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.