ASTM A126 Gray Iron castings intend for use as valve pressure retaining parts, pipe fittings and flanges only, include three casting metal grades: CLASS A, B and C. www.castingquality.com
Reference Casting Standards:
ASTM A126: Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings.
Gray Iron castings can be produced in Casting Quality Industrial:
- Sand Casting
- Shell Casting
- Lost Form Casting
- Centrifugal casting
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- Sand Casting
Casting Quality focus on Metal Parts industry, we provide professional service in Metal Casting field.
Sand Casting is a popular metal form method, are suitable for all materiel, such as grey iron, ductile iron, malleable iron, carbon steel, stainless steel, aluminum and bronze.
- Investment Casting
also named as precision lost wax casting, mainly suitalbe for carbon steel and stainless steel parts. We also provide grey iron and ductile iron and aluminum and bronze parts by investment casting. It can achieve the best appearance with good tolerance
- Shell Casting
Shell casting method is a good option to replace investment casting and sand casting. the quality is better than sand casting parts, suitable for bulk production.
- CNC Machining
CNC Milling, CNC turning with 5 xix CNC center, we provide precision machining for all castings based on customers design drawings.
- CAD Design
Mechanical Design service based on customers requirement, our software is Solidworks and AutoCAD.
- Tools/Mold Design
Mould design and production will be served for metal casting ad plastic injection industry. Based on our more than 10 years experience, we supply professional molds for our customers in Europe and North American.
Gray iron standard grades in ASTM A126：
| Casting Grade | Tensile Strength, min | |
| ksi | Mpa | |
| ASTM A126 Class A | 21 | 145 |
| ASTM A126 Class B | 31 | 214 |
| ASTM A126 Class C | 41 | 283 |
Transvers Testing requirement can be specified by the purchaser：
This test shall be performed with the bar resting on support separated by 12in (305mm) and the load applied midway between the supports. The load shall be applied at the rate that will produce 0.10 in (2.5mm) central deflection in 20 to 40s. In case the transverse test specimen varies from the specified diameter of 1.20in (30.5mm), a correction factor conforming to the requirement for below table.
| Casting Grade | Force at center, min | Deflection at center, min | ||
| Lb | kN | In | mm | |
| ASTM A126 Class A | 2200 | 9.75 | 0.10 | 2.5 |
| ASTM A126 Class B | 3300 | 14.65 | 0.12 | 3.0 |
| ASTM A126 Class C | 4000 | 17.75 | 0.12 | 3.0 |
Chemical Requirements in ASTM A126 standard, only P and S content:
| Casting Grade | Chemical Analysis | |
| P, %, max | S, %, max | |
| ASTM A126 Class A | 0.75 | 0.15 |
| ASTM A126 Class B | 0.75 | 0.15 |
| ASTM A126 Class C | 0.75 | 0.15 |
ASTM A126 Gray Iron Heat treatment requirement: www.castingquality.com
No requirement in standard, but strength relief can be processed if necessary.
ASTM A126 Gray Iron Typical Casting Application
VALVE, FLANGE, PIPE FITTINGS.
No detailed chemistry is listed in ASTM A126 Standards, but we will suggest the chemistry as our experience in Chinese Casting industry:
| ASTM A126 | Chinese Grade | C,% | Si,% | Mn,% | P ≤,% | S≤,% | Gray Iron Hardness (HBS) |
| Class A | HT150 | 3.3-3.5 | 2.0-2.4 | 0.5-0.8 | 0.2 | 0.12 | 150-200 |
| Class B | HT250 | 3.2-3.5 | 1.6-2.0 | 0.7-0.9 | 0.15 | 0.12 | 190-240 |
| Class C | HT300 | 2.9-3.2 | 1.4-1.7 | 0.8-1.0 | 0.15 | 0.12 | 210-260 |
Similar Gray Iron Casting Grades in whole world: www.castingquality.com
| Index | Country | Grey Iron Grade | ||||||
| 1 | China | — | HT350 | HT300 | HT250 | HT200 | HT150 | HT100 |
| 2 | Japanese | — | FC350 | FC300 | FC250 | FC200 | FC150 | FC100 |
| 3 | USA | NO.60 | NO.50 | NO.45 | NO.35/ NO.40 | NO.30 | NO.25 | NO.20 |
| 4 | Russia | CЧ40 | CЧ35 | CЧ30 | CЧ24/CЧ25 | CЧ18/CЧ20/CЧ21 | CЧ15 | CЧ10 |
| 5 | Germany | GG40 | GG35 | GG30 | GG25 | GG20 | GG15 | GG10 |
| 6 | Italy | — | G35 | G30 | G25 | G20 | G15 | G10 |
| 7 | France | FGL400 | FGL350 | FGL300 | FGL250 | FGL200 | FGL150 | — |
| 8 | England | 400 | 350 | 300 | 260 | 180/220 | 150 | 100 |
| 9 | Poland | Z140 | Z135 | Z130 | Z125 | Z120 | Z115 | — |
| 10 | India | FG400 | FG350 | FG300 | FG260 | FG200 | FG150 | — |
| 11 | Romania | FC400 | FC350 | FC300 | FC250 | FC200 | FC150 | — |
| 12 | Spanish | — | FG35 | FG30 | FG25 | FG20 | FG15 | — |
| 13 | Belgium | FGG40 | FGG35 | FGG30 | FGG25 | FGG20 | FGG15 | FGG10 |
| 14 | Australia | T400 | T350 | T300 | T260 | T220 | T150 | — |
| 15 | Sweden | O140 | O135 | O130 | O125 | O120 | O115 | O110 |
| 16 | Hungary | OV40 | OV35 | OV30 | OV25 | OV20 | OV15 | — |
| 17 | Bulgaria | — | Vch35 | Vch30 | Vch25 | Vch20 | Vch15 | — |
| 18 | ISO | — | 350 | 300 | 250 | 200 | 150 | 100 |
| 19 | COPANT | FG400 | FG350 | FG300 | FG250 | FG200 | FG150 | FG100 |
| 20 | Taiwan(CN) | — | — | FC300 | FC250 | FC200 | FC150 | FC100 |
| 21 | Holand | — | GG35 | GG30 | GG25 | GG20 | GG15 | — |
| 22 | Luxemburg | FGG40 | FGG35 | FGG30 | FGG25 | FGG20 | FGG15 | — |
| 23 | Austria | — | GG35 | GG30 | GG25 | GG20 | GG15 | — |
| 24 | Europa-Norm | EN-GJL-350 | EN-GJL-300 | EN-GJL-250 | EN-GJL-200 | EN-GJL-150 | ||
