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| Material: | HT250 | Process: | Green Sand Casting Process |
|---|---|---|---|
| Machining: | CNC Machining | Surface: | Anti-Rust Oil |
| Used For: | Pump Industry | Pakcing: | Crate |
| High Light: | grey iron foundry,grays casting |
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CNC Machining Gray Cast Iron Castings Pump Valve Fittings Flange Parts
Product Description and Process
1.Pump & Valve Fittings Flange Parts Gray Cast Iron Castings Green Sand Castings
2. Production process: green sand molding, pre-coated sand molding and resin sand molding which can produce iron castings from 50 gram to 2000 kilograms
3. Machining process: CNC machine, machining center, lathe, mill machine, drill machine, etc.
4. Surface treatment process: paint coating, electrophoretic coating, electrogalvanizing coating, black oxide coating, phosphate coating, powder coating, etc.
Product Material and Uses
1. Normally produce with gray iron HT200, HT250, Ductile Iron 65-45-12, 60-40-18, 80-55-06, 80-60-03, etc.
2. The ductile iron casting products are widely used for Auto-cars, trains, trucks, vehicle components, mining machinery components, agricultural machinery parts, textile machinery parts, construction machinery parts, valves and pump parts, etc.
Grey Iron Specifications, Characteristics & Applications
• ASTM A48: gray iron castings
• ASTM A74: cast iron soil & pipe fittings
• ASTM A126: gray iron castings for valves, flanges & pipe fittings
• ASTM A159: automotive gray iron castings
• SAE J431: automotive gray iron castings
• ASTM A278 & ASME SA278: gray iron castings for pressure-containing parts
For temperatures up to 650F (343C)
• ASTM A319: gray iron castings for elevated temperatures for
Non-pressure-containing parts
• ASTM A823: statically cast permanent mold castings
• ASTM A834: common requirements for iron castings for general industrial use
Properties of ASTM A48 Classes of gray iron
| Class | Tensile strength (ksi) |
Compressive strength (ksi) |
Tensile modulus, E (Mpsi) |
| 20 | 22 | 83 | 10 |
| 30 | 31 | 109 | 14 |
| 40 | 57 | 140 | 18 |
| 60 | 62.5 | 187.5 | 21 |
Properties of SAE J431 grades of gray iron
| Grade | Brinell hardness | t/h† | Description |
| G1800 | 120–187 | 135 | Ferritic-pearlitic |
| G2500 | 170–229 | 135 | Pearlitic-ferritic |
| G3000 | 187–241 | 150 | Pearlitic |
| G3500 | 207–255 | 165 | Pearlitic |
| G4000 | 217–269 | 175 | Pearlitic |
| †t/h = tensile strength/hardness | |||
Grey Iron Castings Hardness
| Gray Iron Grade | Hardness Grade |
Hardness Range |
Metallography |
| HT100 | H145 | ≤170 | Ferrite |
| HT150 | H175 | 150~200 | Ferrite + Pearlite |
| HT200 | H195 | 170~220 | Pearlite |
| HT250 | H215 | 190~240 | Pearlite |
| HT300 | H235 | 210~260 | Pearlite(Inoculated Cast Iron) |
| HT350 | H255 | 230~280 | Pearlite(Inoculated Cast Iron) |
What is the Composition of Gray Cast Iron?
Just like all cast iron parts, the primary component of Grey Iron is going to be the iron (no surprise there, right?). Just like most other cast irons, it also has 2.5–4.0% carbon and 1–3% silicon. If you look at Chart 2 you will notice that the composition of the iron is very close to other common cast parts, but with a little more phosphorus.
Gray Iron Casting, no any standard mentioned the chemistry composition, so we only suggest the following chemistry based on actual production.
| Grade |
Wall Thickness |
C | Si | Mn |
P |
S |
| HT100 | – | 3.4~3.9 | 2.1~2.6 | 0.5~0.8 | 0.3 | 0.15 |
| HT150 |
<30 |
3.3~3.5 |
2.0~2.4 |
0.5~0.8 |
0.2 |
0.12 |
| HT200 |
<30 |
3.2~3.5 |
1.6~2.0 |
1.7~0.9 |
0.15 |
0.12 |
| HT250 |
<30 |
3.0~3.3 |
1.4~1.7 |
0.8~1.0 |
0.15 |
0.12 |
| HT300 |
<30 |
2.9~3.2 |
1.4~1.7 |
0.8~1.0 |
0.15 |
0.10 |
Contact Person: Mr. James Wang
Tel: +86 13213152686
