Steel A47 M3210-ANN (Annealed)
Heat-treated state · default condition
ASTM A47 M3210 · EN EN-GJMB-350-10, 0.8135 · JIS FCMB · GB KTH330-08
Standard supply condition: white-iron casting fully graphitize-annealed to a ferritic matrix with temper carbon — pick it for ductile, easily machined small fittings and brackets.
Values for the ANN condition
Other A47 M3210 tempers and conditions
A47 M3210 is listed in 3 conditions; see the grade overview at A47 M3210.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed + stress relieved | Low-temperature (about 500–600 °C) stress relief used when tight dimensional stability is needed after straightening or heavy metal removal. | 235 | 355 | 15 | 125 HB | 5 % IACS |
ANNDefaultThis page Annealed | Standard supply condition: white-iron casting fully graphitize-annealed to a ferritic matrix with temper carbon — pick it for ductile, easily machined small fittings and brackets. | 240 | 360 | 14 | 130 HB | — |
Annealed + hot-dip galvanized | Same annealed casting with a hot-dip zinc coating — the normal condition for plumbing/pipe fittings and outdoor line hardware. | 240 | 360 | 13 | 130 HB | 5 % IACS |
What is A47 M3210-ANN?
A47 M3210-ANN is A47 M3210 heat treated to ANN — standard supply condition: white-iron casting fully graphitize-annealed to a ferritic matrix with temper carbon — pick it for ductile, easily machined small fittings and brackets. A47 M3210-ANN has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 96% of steel grades. Elongation at break is 14% and the elastic modulus is 170 GPa (24.7 Msi). A47 M3210-ANN has a density of 7.3 g/cm³ (0.264 lb/in³), lighter than 98% of steel grades. It melts at 1,135°C (2,075 °F).
Advantages
- Easy to machine — 80/100, better than 98% of steel grades
- Conducts heat well — 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
Limitations
- Low stiffness — 170 GPa (24.7 Msi), worse than 97% of steel grades
- Low strength — 240 MPa (34.8 ksi), worse than 96% of steel grades
- Low fracture toughness — 45 MPa·√m (41 ksi·√in), worse than 90% of steel grades
- Low electrical conductivity — 5 % IACS, worse than 82% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
A47 M3210-ANN properties
Typical room-temperature values for A47 M3210-ANN; 13 are specific to this condition. Other listed values are A47 M3210 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A47 M3210-ANN has a density of 7.3 g/cm³ (0.264 lb/in³), lighter than 98% of steel grades. It melts at 1,135°C (2,075 °F).
Mechanical14
A47 M3210-ANN has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 96% of steel grades. Elongation at break is 14% and the elastic modulus is 170 GPa (24.7 Msi).
Thermal6
A47 M3210-ANN is rated for continuous service to 425°C (797 °F). It conducts heat at 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
A47 M3210-ANN conducts electricity at 5 % IACS, worse than 82% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of A47 M3210-ANN takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 85%.
Manufacturability8
A47 M3210-ANN's machinability is very good (80/100, better than 98% of steel grades); weldability poor (28/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A47 M3210-ANN
Is A47 M3210 easy to machine?
One of the easiest ferrous castings to cut — free-machining at 120 % of B1112; use carbide or HSS, dry or with light coolant, and expect short chips from the temper-carbon nodules.
Can A47 M3210 be welded?
Poor: fusion welding re-forms brittle white iron in the HAZ; if unavoidable use Ni or NiFe electrodes, low heat input, preheat 200–300 °C and post-weld anneal, or braze instead.
Can A47 M3210 be formed, bent or molded?
Cast as white iron in green sand/shell moulds with adequate chills, then malleablized 30–60 h; section thickness must stay under about 40 mm for full graphitization, and thin sections can be cold-bent or staked.
What surface finishes work on A47 M3210?
Shot-blast then hot-dip galvanize, zinc/nickel plate, phosphate-and-oil or paint; no anodizing (ferrous). Surfaces take paint well after blasting.
A47 M3210 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 in white-iron base; converted to temper-carbon nodules on annealing | 2.16 – 2.9 | 2.45 |
| Sigraphitizer; controls annealing time | 0.9 – 1.9 | 1.4 |
| Mn | 0.25 – 0.6 | 0.4 |
| S | 0.05 – 0.18 | 0.1 |
| P | ≤ 0.18 | 0.05 |
| Crkept low — retards graphitization | ≤ 0.06 | 0.03 |
| Fe | balance | — |
A47 M3210-ANN — frequently asked
What is A47 M3210-ANN used for?
A47 M3210-ANN is typically used for pipe fittings, hand tools, hardware and small brackets. In short: best-machining malleable iron; ductile alternative to grey iron; galvanizes readily.
What is the yield strength of A47 M3210-ANN?
A47 M3210-ANN has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 96% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A47 M3210-ANN easy to machine?
Yes — machinability is rated very good (80/100, better than 98% of steel grades). One of the easiest ferrous castings to cut — free-machining at 120 % of B1112; use carbide or HSS, dry or with light coolant, and expect short chips from the temper-carbon nodules.
Can A47 M3210-ANN be welded?
Not readily — weldability is rated poor (28/100). Poor: fusion welding re-forms brittle white iron in the HAZ; if unavoidable use Ni or NiFe electrodes, low heat input, preheat 200–300 °C and post-weld anneal, or braze instead.
What surface finishes work on A47 M3210-ANN?
Shot-blast then hot-dip galvanize, zinc/nickel plate, phosphate-and-oil or paint; no anodizing (ferrous). Surfaces take paint well after blasting.
Can A47 M3210-ANN be formed, bent or molded?
Cast as white iron in green sand/shell moulds with adequate chills, then malleablized 30–60 h; section thickness must stay under about 40 mm for full graphitization, and thin sections can be cold-bent or staked.
What is the maximum service temperature of A47 M3210-ANN?
A47 M3210-ANN 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 M3210-ANN and A47 M3210 ANN-SR?
ANN is the default condition — standard supply condition: white-iron casting fully graphitize-annealed to a ferritic matrix with temper carbon — pick it for ductile, easily machined small fittings and brackets. ANN-SR: low-temperature (about 500–600 °C) stress relief used when tight dimensional stability is needed after straightening or heavy metal removal. Yield strength is 240 MPa in ANN versus 235 MPa in ANN-SR.
Sources
- ASTM A602 — Automotive Malleable Iron Castings (grades M3210…M8501) — ASTM International (2018)
- ASTM A47/A47M — Ferritic Malleable Iron Castings (32510, 35018) — ASTM International (2018)
- GB/T 9440 (KTH330-08 ) (2010)
- EN 1562 — Founding: Malleable cast irons (EN-GJMB-350-10, 0.8135) — CEN (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (Malleable Iron) — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
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.