Steel A536 80-55-06
ASTM A536 80-55-06 · EN EN-GJS-500-7, GGG50 · JIS FCD500 · GB QT500-7
ASTM A536 80-55-06 is a ferritic-pearlitic nodular (ductile) cast iron, also designated QT500-7, FCD500, EN-GJS-500-7, GGG50 and 0.7050.
Reference datasheet — A536 80-55-06 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 AS-CAST condition
A536 80-55-06 tempers and conditions
A536 80-55-06 is supplied in 5 conditions, soft to hard. AS-CAST 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 |
|---|---|---|---|---|---|---|
Stress relieved | Pick when residual casting/welding stresses must be removed before precision machining, with almost no loss of strength. | 390 | 565 | 9 | 190 HB | 2.9 % IACS |
AS-CASTDefault ferritic-pearlitic matrix, no post-cast heat treatment | Standard supply condition for 80-55-06 castings: chemistry and cooling rate alone give the 552/379/6 property set. | 400 | 575 | 8 | 195 HB | 2.9 % IACS |
Induction hardened | For wear surfaces (gear teeth, ways, journals): pearlitic matrix transforms to martensite in a shallow case while the core stays tough. | 400 | 575 | 7 | 52 HRC | 2.9 % IACS |
Normalized and tempered | Use to homogenize a mixed matrix in heavy or variable-section castings and raise strength toward the upper end of the grade. | 460 | 680 | 4 | 22 HRC | 2.8 % IACS |
Quenched and tempered | Choose for gears, sprockets and highly loaded parts where a tempered-martensite matrix is needed; ductility drops sharply. | 620 | 850 | 3 | 30 HRC | 2.7 % IACS |
Supply forms, finishes and certifications
Ways A536 80-55-06 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CC-BAR | Continuous Cast Bar | Supply form |
What is A536 80-55-06?
ASTM A536 80-55-06 is a ferritic-pearlitic nodular (ductile) cast iron, also designated QT500-7, FCD500, EN-GJS-500-7, GGG50 and 0.7050. It is the general-purpose medium-duty grade for structural and pressure-containing castings, offering 575 MPa tensile strength, 400 MPa yield, 8 % elongation and 195 HB with a machinability score of 70. Service is limited to 350 °C, welding is repair-only with NiFe electrodes, and thin sections can chill and form hard carbides that damage tools. Choose 60-40-18 for more ductility or 120-90-02 for higher strength and wear resistance. A536 80-55-06 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). A536 80-55-06 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 575 MPa (83.4 ksi) — weaker than 60% of steel grades. Elongation at break is 8% and the elastic modulus is 169 GPa (24.5 Msi).
What is A536 80-55-06 used for?
- crankshafts
- pump bodies
- pressure valves
- gearbox cases
Advantages
- Easy to machine — 70/100, better than 96% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
Limitations
- Limited formability — 5/100, worse than 99% of steel grades
- Low stiffness — 169 GPa (24.5 Msi), worse than 97% of steel grades
- Limited ductility — 8%, worse than 95% of steel grades
- Low fracture toughness — 32 MPa·√m (29.1 ksi·√in), worse than 95% of steel grades
- Low electrical conductivity — 2.9 % IACS, worse than 93% of steel grades
A536 80-55-06 properties
Typical room-temperature values for A536 80-55-06-AS-CAST; bars are the position among steel grades.
Physical3
A536 80-55-06 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).
Mechanical15
A536 80-55-06 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 575 MPa (83.4 ksi) — weaker than 60% of steel grades. Elongation at break is 8% and the elastic modulus is 169 GPa (24.5 Msi).
Thermal6
A536 80-55-06 is rated for continuous service to 350°C (662 °F). It conducts heat at 35 W/m·K (20.2 BTU/hr·ft·°F), worse than 75% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
A536 80-55-06 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 80-55-06 takes about 20 MJ of energy and emits 1.9 kg of CO₂ — less than 99% of steel grades. Typical recycled content is 90%.
Manufacturability7
A536 80-55-06's machinability is very good (70/100, better than 96% of steel grades); weldability poor (30/100); formability not recommended (5/100).
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. A536 80-55-06 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A536 80-55-06
Is A536 80-55-06 easy to machine?
Machines easily with carbide at high feed; graphite gives short chips, but hard carbide edges or chill in thin sections wreck tools — check hardness before finishing.
Can A536 80-55-06 be welded?
Poor weldability: preheat 300–350 °C, NiFe (ENiFe-CI) electrodes, short stringer beads with peening, then stress relieve to avoid a brittle white-iron HAZ.
Can A536 80-55-06 be formed, bent or molded?
Green-sand or shell mould casting with Mg treatment and late inoculation; feed heavy sections and control cooling rate to keep the matrix in the ferritic-pearlitic window.
A536 80-55-06 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 practice shown | 3.2 – 3.9 | 3.6 |
| Si | 2 – 3 | 2.5 |
| Mnhigher Mn promotes pearlite | 0.15 – 0.6 | 0.35 |
| P | ≤ 0.05 | 0.03 |
| Slow S required for nodulizing | ≤ 0.02 | 0.01 |
| Mgresidual nodulizer | 0.03 – 0.06 | 0.04 |
| Cupearlite stabilizer, optional | 0 – 0.8 | 0.4 |
| Nioptional | 0 – 0.5 | — |
| Fe | balance | — |
What surface finishes work on A536 80-55-06?
Not anodizable; protect with shot blast + epoxy/zinc-rich primer, powder coat, phosphate, or hard chrome/nitride on bearing surfaces; polishing is limited by graphite pull-out.
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 A536 80-55-06 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- EN-GJS-500-7GGG500.7050
- GB (China)
- QT500-7
- JIS
- FCD500
How much does A536 80-55-06 cost?
A536 80-55-06 is a budget-cost steel ($), cheaper than about 90% 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.
A536 80-55-06 — frequently asked
What is A536 80-55-06 used for?
A536 80-55-06 is typically used for crankshafts, pump bodies, pressure valves and gearbox cases. In short: workhorse ductile iron grade; balanced strength and ductility; good machinability at 195 HB.
What is the yield strength of A536 80-55-06?
A536 80-55-06 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 575 MPa (83.4 ksi) — weaker than 60% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is A536 80-55-06 easy to machine?
Yes — machinability is rated very good (70/100, better than 96% of steel grades). Machines easily with carbide at high feed; graphite gives short chips, but hard carbide edges or chill in thin sections wreck tools — check hardness before finishing.
Can A536 80-55-06 be welded?
Not readily — weldability is rated poor (30/100). Poor weldability: preheat 300–350 °C, NiFe (ENiFe-CI) electrodes, short stringer beads with peening, then stress relieve to avoid a brittle white-iron HAZ.
What surface finishes work on A536 80-55-06?
Not anodizable; protect with shot blast + epoxy/zinc-rich primer, powder coat, phosphate, or hard chrome/nitride on bearing surfaces; polishing is limited by graphite pull-out.
Can A536 80-55-06 be formed, bent or molded?
Green-sand or shell mould casting with Mg treatment and late inoculation; feed heavy sections and control cooling rate to keep the matrix in the ferritic-pearlitic window.
What is the maximum service temperature of A536 80-55-06?
A536 80-55-06 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A536 80-55-06 AS-CAST and A536 80-55-06-QT?
AS-CAST is the default condition — standard supply condition for 80-55-06 castings: chemistry and cooling rate alone give the 552/379/6 property set. QT: choose for gears, sprockets and highly loaded parts where a tempered-martensite matrix is needed; ductility drops sharply. Yield strength is 400 MPa in AS-CAST versus 620 MPa in QT.
How much does A536 80-55-06 cost?
A536 80-55-06 is a budget-cost steel ($), cheaper than about 90% 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 A536 Standard Specification for Ductile Iron Castings — ASTM International (2019)
- EN 1563 Founding — Spheroidal graphite cast irons (EN-GJS-500-7) — CEN (2018)
- GB/T 1348 (QT500-7) — SAC (2019)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels — ASM International (1990)
- Ductile Iron Data for Design Engineers — Ductile Iron Society / Rio Tinto Iron & Titanium (2013)
- Dura-Bar 80-55-06 continuous cast ductile iron — Dura-Bar (Charter Manufacturing) (2022)
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.