Steel A220 45008
ASTM A220 45008 · GB KTZ450-06
ASTM A220 45008 is a pearlitic malleable cast iron — annealed white iron that is then quenched and tempered to a pearlitic matrix — with equivalents FCMP450 and KTZ450-06.
Reference datasheet — A220 45008 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 AQT condition
A220 45008 tempers and conditions
A220 45008 is supplied in 3 conditions, soft to hard. AQT is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AQTDefault Graphitized, air quenched and tempered | Default condition: parts are air-quenched from the austenitizing/graphitizing cycle and tempered to hit 45008 property window — best cost/strength balance for automotive and machinery castings. | 330 | 470 | 10 | 175 HB | 4.7 % IACS |
Induction hardened | Use when wear surfaces (gear teeth, cam faces, bearing journals) need a hard case while the body keeps 45008 strength and ductility; the pearlitic matrix responds well to local hardening. | 330 | 470 | 9 | 55 HRC | 4.7 % IACS |
Oil quenched and tempered to grade 45008 properties | Pick for heavier sections or where a fully tempered martensitic/sorbitic matrix is wanted: slightly higher toughness and more uniform hardness through the wall than air quenching, at higher processing cost and distortion risk. | 345 | 500 | 11 | 183 HB | 4.6 % IACS |
What is A220 45008?
ASTM A220 45008 is a pearlitic malleable cast iron — annealed white iron that is then quenched and tempered to a pearlitic matrix — with equivalents FCMP450 and KTZ450-06. It provides 330 MPa yield, 470 MPa tensile, 10 % elongation and 175 HB (88 HRB), giving more strength and wear resistance than ferritic malleable grades for gears, connecting rods and loaded fittings. Section size is limited by the white-iron casting step, fusion welding is poor and service tops out near 400 °C; quenched-and-tempered ductile iron is the usual substitute for larger castings. A220 45008 has a density of 7.27 g/cm³ (0.263 lb/in³), lighter than 99% of steel grades. It melts at 1,135°C (2,075 °F). A220 45008 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 78% of steel grades. Elongation at break is 10% and the elastic modulus is 172 GPa (24.9 Msi).
What is A220 45008 used for?
- gears
- connecting rods
- camshafts
- high-strength fittings
Advantages
- Low embodied carbon — 1.8 kg CO₂/kg, better than 99% of steel grades
Limitations
- Low stiffness — 172 GPa (24.9 Msi), worse than 96% of steel grades
- Limited ductility — 10%, worse than 91% of steel grades
- Low fracture toughness — 45 MPa·√m (41 ksi·√in), worse than 90% of steel grades
- Limited formability — 15/100, worse than 87% of steel grades
- Low electrical conductivity — 4.7 % IACS, worse than 82% of steel grades
A220 45008 properties
Typical room-temperature values for A220 45008-AQT; bars are the position among steel grades.
Physical3
A220 45008 has a density of 7.27 g/cm³ (0.263 lb/in³), lighter than 99% of steel grades. It melts at 1,135°C (2,075 °F).
Mechanical16
A220 45008 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 78% of steel grades. Elongation at break is 10% and the elastic modulus is 172 GPa (24.9 Msi).
Thermal6
A220 45008 is rated for continuous service to 400°C (752 °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
A220 45008 conducts electricity at 4.7 % IACS, worse than 82% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of A220 45008 takes about 20 MJ of energy and emits 1.8 kg of CO₂ — less than 99% of steel grades. Typical recycled content is 90%.
Manufacturability7
A220 45008's machinability is good (58/100, better than 75% of steel grades); weldability poor (25/100); formability poor (15/100).
Common Calculations5
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. A220 45008 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A220 45008
Is A220 45008 easy to machine?
Machines like a medium-carbon steel but freer-cutting thanks to temper-carbon nodules; use carbide or coated carbide at moderate speeds, and machine before any selective surface hardening.
Can A220 45008 be welded?
Poor fusion weldability — preheat 300–400 °C, use Ni or NiFe electrodes/braze welding and slow cool, then re-temper; avoid welded joints in load paths where possible.
Can A220 45008 be formed, bent or molded?
Cast as thin-wall white iron in green sand or shell molds (heavy sections resist graphitization), then long graphitizing anneal followed by air/oil quench and temper; limited cold coining and straightening only.
A220 45008 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 of white-iron base; converts to temper carbon on annealing | 2.2 – 2.9 | 2.5 |
| Si | 0.9 – 1.9 | 1.4 |
| Mnkept higher than ferritic malleable to stabilize pearlite | 0.25 – 1.25 | 0.6 |
| P | ≤ 0.18 | 0.08 |
| S | 0.05 – 0.2 | 0.12 |
| Crheld low to avoid stable carbides | ≤ 0.1 | 0.04 |
| FeASTM A220 does not fix chemistry; composition is at the foundry's option provided mechanical and hardness requirements are met | balance | — |
What surface finishes work on A220 45008?
Shot blast to remove anneal scale; protect with paint, phosphate+oil, zinc plating or hot-dip galvanizing (classic for malleable fittings); accepts nitriding/hard chrome for wear duty.
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 A220 45008 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- KTZ450-06
- Similar grades
- FCMP450
How much does A220 45008 cost?
A220 45008 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.
A220 45008 — frequently asked
What is A220 45008 used for?
A220 45008 is typically used for gears, connecting rods, camshafts and high-strength fittings. In short: stronger than ferritic malleable; free-cutting at 175 HB; surface-hardenable wear parts.
What is the yield strength of A220 45008?
A220 45008 has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A220 45008 easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like a medium-carbon steel but freer-cutting thanks to temper-carbon nodules; use carbide or coated carbide at moderate speeds, and machine before any selective surface hardening.
Can A220 45008 be welded?
Not readily — weldability is rated poor (25/100). Poor fusion weldability — preheat 300–400 °C, use Ni or NiFe electrodes/braze welding and slow cool, then re-temper; avoid welded joints in load paths where possible.
What surface finishes work on A220 45008?
Shot blast to remove anneal scale; protect with paint, phosphate+oil, zinc plating or hot-dip galvanizing (classic for malleable fittings); accepts nitriding/hard chrome for wear duty.
Can A220 45008 be formed, bent or molded?
Cast as thin-wall white iron in green sand or shell molds (heavy sections resist graphitization), then long graphitizing anneal followed by air/oil quench and temper; limited cold coining and straightening only.
What is the maximum service temperature of A220 45008?
A220 45008 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A220 45008-AQT and A220 45008-OQT?
AQT is the default condition — default condition: parts are air-quenched from the austenitizing/graphitizing cycle and tempered to hit 45008 property window — best cost/strength balance for automotive and machinery castings. OQT: pick for heavier sections or where a fully tempered martensitic/sorbitic matrix is wanted: slightly higher toughness and more uniform hardness through the wall than air quenching, at higher processing cost and distortion risk. Yield strength is 330 MPa in AQT versus 345 MPa in OQT.
How much does A220 45008 cost?
A220 45008 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 A220/A220M — Standard Specification for Pearlitic Malleable Iron — ASTM International (2018)
- GB/T 9440 (KTZ450-06) (2010)
- JIS G 5705 Malleable iron castings (FCMP450) — JISC (2018)
- ASM Handbook Vol. 1: Properties and Selection — Malleable Iron — ASM International (1990)
- ASM Handbook Vol. 16: Machining — Machinability of Cast Irons — ASM International (1989)
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.