Gray Iron castings in ASMT A48 are intended for general engineering use where tensile strength is a major consideration. It’s different use against to ASMT A126 or ASTM A278. And ASTM A48 is the most popular standard for grey iron. castingquality.com
Reference Casting Standards:
ASTM A48 Standard Specification for Gray Iron Castings
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
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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.
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castings ordered and produced in accordance with this specification are classified into a number of grades based on the properties of separately cast test bars. A, B, C and S
| Requirements for Tensile Strength of Gray Cast Irons in Separately Cast Test Bar (Inch-Pound) | ||
| Casting Grade | Tensile Strength, min, ksi | Nominal Test Bar Diameter, inch |
| ASTM A48 Class No. 20 A | 20 | 0.8 |
| ASTM A48 Class No. 20 B | 1.2 | |
| ASTM A48 Class No. 20 C | 2.0 | |
| ASTM A48 Class No. 20 S | Bar S | |
| ASTM A48 Class No. 25 A | 25 | 0.88 |
| ASTM A48 Class No. 25 B | 1.2 | |
| ASTM A48 Class No. 25 C | 2.0 | |
| ASTM A48 Class No. 25 S | Bar S | |
| ASTM A48 Class No. 30 A | 30 | 0.88 |
| ASTM A48 Class No. 30 B | 1.2 | |
| ASTM A48 Class No. 30 C | 2.0 | |
| ASTM A48 Class No. 30 S | Bar S | |
| ASTM A48 Class No. 35 A | 35 | 0.88 |
| ASTM A48 Class No. 35 B | 1.2 | |
| ASTM A48 Class No. 35 C | 2.0 | |
| ASTM A48 Class No. 35 S | Bar S | |
| ASTM A48 Class No. 40 A | 40 | 0.88 |
| ASTM A48 Class No. 40 B | 1.2 | |
| ASTM A48 Class No. 40 C | 2.0 | |
| ASTM A48 Class No. 40 S | Bar S | |
| ASTM A48 Class No. 45 A | 45 | 0.88 |
| ASTM A48 Class No. 45 B | 1.2 | |
| ASTM A48 Class No. 45 C | 2.0 | |
| ASTM A48 Class No. 45 S | Bar S | |
| ASTM A48 Class No. 50 A | 50 | 0.88 |
| ASTM A48 Class No. 50 B | 1.2 | |
| ASTM A48 Class No. 50 C | 2.0 | |
| ASTM A48 Class No. 50 S | Bar S | |
| ASTM A48 Class No. 55 A | 55 | 0.88 |
| ASTM A48 Class No. 55 B | 1.2 | |
| ASTM A48 Class No. 55 C | 2.0 | |
| ASTM A48 Class No. 55 S | Bar S | |
| ASTM A48 Class No. 60 A | 60 | 0.88 |
| ASTM A48 Class No. 60 B | 1.2 | |
| ASTM A48 Class No. 60 C | 2.0 | |
| ASTM A48 Class No. 60 S | Bar S | |
| Requirements for Tensile Strength of Gray Cast Irons in Separately Cast Test Bar (Metric) | ||
| Casting Grade | Tensile Strength, min, MPa | Nominal Test Bar diameter, mm |
| ASTM A48 Class No. 150 A | 150 | 20 to 22 |
| ASTM A48 Class No. 150 B | 30 | |
| ASTM A48 Class No. 150 C | 50 | |
| ASTM A48 Class No. 150 S | Bar S | |
| ASTM A48 Class No. 175 A | 175 | 20 to 22 |
| ASTM A48 Class No. 175 B | 30 | |
| ASTM A48 Class No. 175 C | 50 | |
| ASTM A48 Class No. 175 S | Bar S | |
| ASTM A48 Class No. 200 A | 200 | 20 to 22 |
| ASTM A48 Class No. 200 B | 30 | |
| ASTM A48 Class No. 200 C | 50 | |
| ASTM A48 Class No. 200 S | Bar S | |
| ASTM A48 Class No. 225 A | 225 | 20 to 22 |
| ASTM A48 Class No. 225 B | 30 | |
| ASTM A48 Class No. 225 C | 50 | |
| ASTM A48 Class No. 225 S | Bar S | |
| ASTM A48 Class No. 250 A | 250 | 20 to 22 |
| ASTM A48 Class No. 250 B | 30 | |
| ASTM A48 Class No. 250 C | 50 | |
| ASTM A48 Class No. 250 S | Bar S | |
| ASTM A48 Class No. 275 A | 275 | 20 to 22 |
| ASTM A48 Class No. 275 B | 30 | |
| ASTM A48 Class No. 275 C | 50 | |
| ASTM A48 Class No. 275 S | Bar S | |
| ASTM A48 Class No. 300 A | 300 | 20 to 22 |
| ASTM A48 Class No. 300 B | 30 | |
| ASTM A48 Class No. 300 C | 50 | |
| ASTM A48 Class No. 300 S | Bar S | |
| ASTM A48 Class No. 325 A | 325 | 20 to 22 |
| ASTM A48 Class No. 325 B | 30 | |
| ASTM A48 Class No. 325 C | 50 | |
| ASTM A48 Class No. 325 S | Bar S | |
| ASTM A48 Class No. 350 A | 350 | 20 to 22 |
| ASTM A48 Class No. 350 B | 30 | |
| ASTM A48 Class No. 350 C | 50 | |
| ASTM A48 Class No. 350 S | Bar S | |
| ASTM A48 Class No. 375 A | 375 | 20 to 22 |
| ASTM A48 Class No. 375 B | 30 | |
| ASTM A48 Class No. 375 C | 50 | |
| ASTM A48 Class No. 375 S | Bar S | |
| ASTM A48 Class No. 400 A | 400 | 20 to 22 |
| ASTM A48 Class No. 400 B | 30 | |
| ASTM A48 Class No. 400 C | 50 | |
| ASTM A48 Class No. 400 S | Bar S | |
Separately Cast Test Bar for use when a specific correlation has not been established between the Test Bar and the Casting for ASMT A48. Castingquality.com
| Thickness of the wall of controlling section of the casting, in[mm] | Test Bar |
| Under 0.25 [under 5] | S |
| 0.25 to 0.50 [5 to 14 | A |
| 0.51 to 1.00 [15 to 25] | B |
| 1.01 to 2 [26 to 50] | C |
| Over 2 [over 50] | S |
Diameter and lengths of Cast Test Bars for ASTM A48:
| Test Bar | As-Cast Diameter, in.[mm] | Length, in.[mm] | |||
| Nominal | Minimum | Maximum | Minimum | Maximum | |
| A | 0.88 [22.4] | 0.85 [21.6] | 0.96 [24.4] | 5.0 [125] | 6.0 [150] |
| B | 1.20 [30.5] | 1.14 [29.0] | 1.32 [33.5] | 6.0 [150] | 9.0 [230] |
| C | 2.00 [50.8] | 1.90 [48.3] | 2.10 [53.3] | 7.0 [175] | 10.0 [255] |
| S | All dimensions shall be as agreed upon by the manufacture and the purchaser | ||||
What means of ASTM A48 Class 30B?
Each class is designated by a number followed by a letter in ASTM A48 standard. The number indicate the minimum tensile strength of the separately cast test bar, and the letter indicates the size of the test bar. 30 mean 30 KSI tensile strength in Test Bar B type. castingquality.com
ASTM A48 Cast Gray Iron Test Specimen details:castingquality.com
ASTM A48 Cast Gray Iron Test Specimen
| Dimensions, in [mm] | Tension Test Specimen A | Tension Test Specimen B | Tension Test Specimen C |
| G-Length of parallel, min | 0.50 [13] | 0.75 [19] | 1.25 [32] |
| D-Diameter | 0.500±0.010 [13±0.25] | 0.750±0.015 [20±0.4] | 1.25±0.025 [30±0.6] |
| R-Radius of fillet, min | 1 [25] | 1 [25] | 2 [50] |
| A-Length of reduced section, min | 1-1/4 [32] | 1-1/2 [38] | 2-1/4 [57] |
| L-Over all length, min | 3-3/4 [95] | 4 [100] | 6-3/8 [160] |
| C-Diameter of end section, approx. | 7/8 [22.2] | 1-1/4 [31.8] | 1 7/8 [47] |
| E-Length of shoulder, min | 1/4 [6] | 1/4 [6] | 5/16 [8] |
| F-Diameter of shoulder | 5/8±1/64 [16±0.4] | 15/16±1/64 [24±0.4] | 1-7/16±1/64 [36±0.4] |
| B-Length of end section | Optional to fit holders on testing machine. If threaded, root diameter shall not be less than dimension F. | ||
ASTM A48 Gray Iron Heat treatment requirement: castingquality.com
no requirement in standard, but strength relief can be processed if necessary.
ASTM A48 Gray Iron Typical Casting Application
- Automotive castings (brake drums, clutch plates, heads, cylinder liners, pistons)
- Ingot mould
- Machine part
- Diesel engine block
- Gearboxe
- Flywheel
- Counterweight
- Pump parts
ASTM A48 Chemical Requirements: castingquality.com
No detailed requirement about chemistry in ASTM A126 Standards, but we will suggest the chemistry as our experience in Casting industry, pls visit our web page of grey iron property and chemistry.
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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 | ||
