LETH IRON MATERIAL SPECIFICATIONS
DUCTILE IRONASTM A536 - 84
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| Grade | Min. Tensile (psi) | Min. Yield (psi) | Elongation (%) | Typical HBW | |
| 60-40-18 | 60,000 | 40,000 | 18 | 140 - 190 | |
| 65-45-12 | 65,000 | 45,000 | 12 | 160 - 220 | |
| 70-50-09 | 70,000 | 50,000 | 9 | 170 - 230 | |
| 80-55-06 | 80,000 | 55,000 | 6 | 190 - 260 | |
| 100-70-03 | 100,000 | 70,000 | 3 | 240 - 310 | |
DUCTILE IRONASTM A395 - 99 (castings of this specification will be annealed to a ferritic structure)
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| Grade | Min. Tensile (psi) | Min. Yield (psi) | Elongation (%) | Typical HBW | |
| 60-40-18 | 60,000 | 40,000 | 18 | 143 - 187 | |
About 75% of our production is Ductile Iron. LETH IRON was one of the first foundries in North America to pour this unique material in the early 1960's. Ductile Iron provides excellent strengths, great value and is very machinable. Strengths meeting or exceeding mild and low alloy steel castings at approximately half the cost make this iron very popular. In addition, Ductile Iron offers improved cosmetics and dimensional stability in comparison to steel castings. Due to the higher carbon value in iron, please note we do not recommend welding Ductile Iron (or any other iron).
AUSTEMPERED DUCTILE IRON [ADI]ASTM A897 - 06 (castings of this specification are heat treated by an austempering process)
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| Grade | Min. Tensile (psi) | Min. Yield (psi) | Elongation (%) | Typical HBW |
| 110-70-11 | 110,000 | 70,000 | 11 | 241 - 302 |
| 130-90-09 | 130,000 | 90,000 | 9 | 269 - 341 |
| 150-110-07 | 150,000 | 110,000 | 7 | 302 - 375 |
| 175-125-04 | 175,000 | 125,000 | 4 | 341 - 444 |
| 200-155-02 | 200,000 | 155,000 | 2 | 388 - 477 |
| 230-185-01 | 230,000 | 185,000 | 1 | 402 - 512 |
About 5% of our production is Austempered Ductile Iron (ADI). A sophisticated heat treatment and quench doubles the strength of Ductile Iron castings while maintaining elongation strengths. Gains in casting hardness also provide attractive wear properties. ADI can normally be machined before heat treating, but may require some minor post heat treatment machining to hold very tight machining tolerances. Use of this exciting and relatively new material is growing quickly!
ABRASION RESISTANT IRONASTM A532 - 93a ("HIGH CHROME - YC")
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| Class/Type | % Chrome | Typical HBW |
| Class III Type A |
27% Chrome | 550 - 700 |
About 10% of our production is Hi-Chrome Iron. This material is relatively brittle, but provides superior abrasion resistance compared to any other wear resistant iron casting. Hardness exceed 600 HBW.This material is used extensively in ground engaging wear applications and in the mining & aggregate industries.
CARBIDIC AUSTEMPERED DUCTILE IRON (CADI)ASTM - n/a
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| Strength Requirements | Typical HBW |
| Strengths (tensile, yield and elongation) are not specified for CADI and are secondary to hardness requirements. |
500 - 600 (10-30% Carbides) |
This new material provides superior wear characteristics due to its increased hardness, but exhibits less strength and elongation when compared to ADI. CADI also has higher impact resistance versus High Chrome Iron, but It does not offer the superior abrasion resistance that High Chrome Iron provides.
GRAY IRONASTM A48 - 03
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| Grade | LIW Ref Code | Min. Tensile (psi) | Min. Yield (psi) | Elongation (%) | Typical HBW | |
| 20 | C20 | 20,000 | 120 - 180 | |||
| 25 | C25 | 25,000 | 150 - 210 | |||
| 30 | C30 | 30,000 | 180 - 240 | |||
| 35 | C35 | 35,000 | 180 - 240 | |||
| 40 | C40 | 40,000 | 210 - 270 | |||
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LETH IRON. FLUENT IN IRON.
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 720 32nd Street North, Lethbridge, AB T1H 5K5
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ph: (403) 329-4242
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fax: (403) 327-1131
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