Steel A536 100-70-03 FH/IH
Heat-treated state
ASTM A536 100-70-03 · EN EN-GJS-700-2, GGG70 · JIS FCD700 · GB QT700-2
FH/IH = flame or Induction Surface Hardened
Select for gear teeth, journals and slideways needing a hard wear surface and compressive residual stress while keeping a tough pearlitic core.
Values for the FH/IH condition
Other A536 100-70-03 tempers and conditions
A536 100-70-03 is listed in 5 conditions; see the grade overview at A536 100-70-03.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress relieved | Use for dimensionally critical machined castings (housings, machine bases) to remove casting/welding residual stress with minimal loss of strength. | 505 | 730 | 5 | 21 HRC | 2.9 % IACS |
AS-CASTDefault no post-cast heat treatment | Standard commercial condition: pearlite promoted by Cu/Mn alloying and controlled cooling; cheapest way to meet 100-70-03. | 520 | 760 | 4 | 23 HRC | — |
FH/IHThis page Flame or Induction Surface Hardened | Select for gear teeth, journals and slideways needing a hard wear surface and compressive residual stress while keeping a tough pearlitic core. | 520 | 760 | 3 | 52 HRC | 2.9 % IACS |
Normalized and tempered | Choose when section thickness or chemistry cannot give uniform as-cast pearlite; gives more consistent strength and hardness through the section. | 550 | 800 | 4 | 26 HRC | — |
Quenched and tempered | Pick for the highest through-strength and wear resistance in the 100-70-03 family (tempered martensite matrix), at the cost of machinability and distortion risk. | 620 | 860 | 3 | 30 HRC | — |
What is A536 100-70-03 FH/IH?
A536 100-70-03 FH/IH is A536 100-70-03 heat treated to FH/IH — select for gear teeth, journals and slideways needing a hard wear surface and compressive residual stress while keeping a tough pearlitic core. A536 100-70-03 FH/IH has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 67% of steel grades. Elongation at break is 3% and the elastic modulus is 169 GPa (24.5 Msi). A536 100-70-03 FH/IH has a density of 7.1 g/cm³ (0.257 lb/in³), lighter than 99% of steel grades. It melts at 1,150°C (2,102 °F). AS-CAST is the default condition FabDigit quotes; FH/IH is available on request or by drawing note.
Advantages
- Low embodied carbon — 1.7 kg CO₂/kg, better than 99% of steel grades
Limitations
- Limited formability — 1/100, worse than 100% of steel grades
- Limited ductility — 3%, worse than 99% of steel grades
- Difficult to weld — 10/100, worse than 99% of steel grades
- Low stiffness — 169 GPa (24.5 Msi), worse than 97% of steel grades
- Low fracture toughness — 25 MPa·√m (22.8 ksi·√in), worse than 97% of steel grades
A536 100-70-03 FH/IH properties
Typical room-temperature values for A536 100-70-03 FH/IH; 22 are specific to this condition. Other listed values are A536 100-70-03 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A536 100-70-03 FH/IH has a density of 7.1 g/cm³ (0.257 lb/in³), lighter than 99% of steel grades. It melts at 1,150°C (2,102 °F).
Mechanical17
A536 100-70-03 FH/IH has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 67% of steel grades. Elongation at break is 3% and the elastic modulus is 169 GPa (24.5 Msi).
Thermal6
A536 100-70-03 FH/IH is rated for continuous service to 250°C (482 °F). It conducts heat at 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 82% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
A536 100-70-03 FH/IH conducts electricity at 2.9 % IACS, worse than 93% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of A536 100-70-03 FH/IH takes about 20 MJ of energy and emits 1.7 kg of CO₂ — less than 99% of steel grades. Typical recycled content is 85%.
Manufacturability7
A536 100-70-03 FH/IH's machinability is poor (20/100, worse than 97% of steel grades); weldability not recommended (10/100); formability not recommended (1/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A536 100-70-03 FH/IH
Is A536 100-70-03 easy to machine?
Machines well with carbide or ceramic at 120–250 m/min dry; graphite nodules break chips, but carbide edges wear faster than on ferritic grades and hard casting skin/carbides should be taken in one deep first cut.
Can A536 100-70-03 be welded?
Poor weldability — use NiFe (ENiFe-CI) electrodes, 300–400 °C preheat, short low-heat stringer beads with peening, then stress relieve; structural welding is generally avoided in favour of repair welding only.
Can A536 100-70-03 be formed, bent or molded?
Green-sand or shell mould casting with Mg treatment and late inoculation; keep section modulus adequate for nodularity and use risers/chills to avoid shrinkage and carbide in thin sections.
What surface finishes work on A536 100-70-03?
Shot blast then prime/paint or apply zinc-rich or epoxy coating for corrosion protection; hard chrome, nitriding and phosphating all work, but polishing is limited by exposed graphite nodules.
A536 100-70-03 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 |
|---|---|---|
| CASTM A536 does not specify chemistry; typical foundry range | 3.3 – 3.9 | 3.6 |
| Si | 2 – 2.8 | 2.4 |
| Mnpearlite stabilizer | 0.2 – 0.6 | 0.4 |
| Cuadded to promote as-cast pearlite | 0.3 – 0.9 | 0.6 |
| Nioptional, heavy sections | 0 – 1 | 0.2 |
| Mgresidual, nodulizing | 0.03 – 0.06 | 0.04 |
| P | ≤ 0.05 | 0.03 |
| S | ≤ 0.02 | 0.01 |
| Fe | balance | — |
A536 100-70-03 FH/IH — frequently asked
What is A536 100-70-03 FH/IH used for?
A536 100-70-03 FH/IH is typically used for crankshafts, gears, heavy machinery parts and hydraulic components. In short: high-strength pearlitic ductile iron; wear resistance without alloy steel; flame/induction hardenable.
What is the yield strength of A536 100-70-03 FH/IH?
A536 100-70-03 FH/IH has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 67% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is A536 100-70-03 FH/IH easy to machine?
Not especially — machinability is rated poor (20/100, worse than 97% of steel grades). Machines well with carbide or ceramic at 120–250 m/min dry; graphite nodules break chips, but carbide edges wear faster than on ferritic grades and hard casting skin/carbides should be taken in one deep first cut.
Can A536 100-70-03 FH/IH be welded?
Not readily — weldability is rated not recommended (10/100). Poor weldability — use NiFe (ENiFe-CI) electrodes, 300–400 °C preheat, short low-heat stringer beads with peening, then stress relieve; structural welding is generally avoided in favour of repair welding only.
What surface finishes work on A536 100-70-03 FH/IH?
Shot blast then prime/paint or apply zinc-rich or epoxy coating for corrosion protection; hard chrome, nitriding and phosphating all work, but polishing is limited by exposed graphite nodules.
Can A536 100-70-03 FH/IH be formed, bent or molded?
Green-sand or shell mould casting with Mg treatment and late inoculation; keep section modulus adequate for nodularity and use risers/chills to avoid shrinkage and carbide in thin sections.
What is the maximum service temperature of A536 100-70-03 FH/IH?
A536 100-70-03 FH/IH is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A536 100-70-03 AS-CAST and A536 100-70-03-SR?
AS-CAST is the default condition — standard commercial condition: pearlite promoted by Cu/Mn alloying and controlled cooling; cheapest way to meet 100-70-03. SR: use for dimensionally critical machined castings (housings, machine bases) to remove casting/welding residual stress with minimal loss of strength. Yield strength is 520 MPa in AS-CAST versus 505 MPa in SR.
Sources
- ASTM A536 — Standard Specification for Ductile Iron Castings — ASTM International (2019)
- EN 1563 — Founding: Spheroidal graphite cast irons (EN-GJS-700-2) — CEN (2018)
- GB/T 1348 (QT700-2) — SAC (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Ductile Iron Data for Design Engineers — Ductile Iron Society / Rio Tinto Iron & Titanium (2013)
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.