February 17, 2020

Gray Iron in ASTM A48

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
ASTM A48 Cast Gray Iron Test Specimen

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  1. 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.

  2. 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

  3. Shell Casting

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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 GradeTensile Strength, min, ksiNominal Test Bar Diameter, inch
ASTM A48 Class No. 20 A200.8
ASTM A48 Class No. 20 B1.2
ASTM A48 Class No. 20 C2.0
ASTM A48 Class No. 20 SBar S
ASTM A48 Class No. 25 A250.88
ASTM A48 Class No. 25 B1.2
ASTM A48 Class No. 25 C2.0
ASTM A48 Class No. 25 SBar S
ASTM A48 Class No. 30 A300.88
ASTM A48 Class No. 30 B1.2
ASTM A48 Class No. 30 C2.0
ASTM A48 Class No. 30 SBar S
ASTM A48 Class No. 35 A350.88
ASTM A48 Class No. 35 B1.2
ASTM A48 Class No. 35 C2.0
ASTM A48 Class No. 35 SBar S
ASTM A48 Class No. 40 A400.88
ASTM A48 Class No. 40 B1.2
ASTM A48 Class No. 40 C2.0
ASTM A48 Class No. 40 SBar S
ASTM A48 Class No. 45 A450.88
ASTM A48 Class No. 45 B1.2
ASTM A48 Class No. 45 C2.0
ASTM A48 Class No. 45 SBar S
ASTM A48 Class No. 50 A500.88
ASTM A48 Class No. 50 B1.2
ASTM A48 Class No. 50 C2.0
ASTM A48 Class No. 50 SBar S
ASTM A48 Class No. 55 A550.88
ASTM A48 Class No. 55 B1.2
ASTM A48 Class No. 55 C2.0
ASTM A48 Class No. 55 SBar S
ASTM A48 Class No. 60 A600.88
ASTM A48 Class No. 60 B1.2
ASTM A48 Class No. 60 C2.0
ASTM A48 Class No. 60 SBar S
Requirements for Tensile Strength of Gray Cast Irons in Separately Cast Test Bar (Metric)
Casting GradeTensile Strength, min, MPaNominal Test Bar diameter, mm
ASTM A48 Class No. 150 A15020 to 22
ASTM A48 Class No. 150 B30
ASTM A48 Class No. 150 C50
ASTM A48 Class No. 150 SBar S
ASTM A48 Class No. 175 A17520 to 22
ASTM A48 Class No. 175 B30
ASTM A48 Class No. 175 C50
ASTM A48 Class No. 175 SBar S
ASTM A48 Class No. 200 A20020 to 22
ASTM A48 Class No. 200 B30
ASTM A48 Class No. 200 C50
ASTM A48 Class No. 200 SBar S
ASTM A48 Class No. 225 A22520 to 22
ASTM A48 Class No. 225 B30
ASTM A48 Class No. 225 C50
ASTM A48 Class No. 225 SBar S
ASTM A48 Class No. 250 A25020 to 22
ASTM A48 Class No. 250 B30
ASTM A48 Class No. 250 C50
ASTM A48 Class No. 250 SBar S
ASTM A48 Class No. 275 A27520 to 22
ASTM A48 Class No. 275 B30
ASTM A48 Class No. 275 C50
ASTM A48 Class No. 275 SBar S
ASTM A48 Class No. 300 A30020 to 22
ASTM A48 Class No. 300 B30
ASTM A48 Class No. 300 C50
ASTM A48 Class No. 300 SBar S
ASTM A48 Class No. 325 A32520 to 22
ASTM A48 Class No. 325 B30
ASTM A48 Class No. 325 C50
ASTM A48 Class No. 325 SBar S
ASTM A48 Class No. 350 A35020 to 22
ASTM A48 Class No. 350 B30
ASTM A48 Class No. 350 C50
ASTM A48 Class No. 350 SBar S
ASTM A48 Class No. 375 A37520 to 22
ASTM A48 Class No. 375 B30
ASTM A48 Class No. 375 C50
ASTM A48 Class No. 375 SBar S
ASTM A48 Class No. 400 A40020 to 22
ASTM A48 Class No. 400 B30
ASTM A48 Class No. 400 C50
ASTM A48 Class No. 400 SBar 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 14A
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 BarAs-Cast Diameter, in.[mm]Length, in.[mm]
NominalMinimumMaximumMinimumMaximum
A0.88 [22.4]0.85 [21.6]0.96 [24.4]5.0 [125]6.0 [150]
B1.20 [30.5]1.14 [29.0]1.32 [33.5]6.0 [150]9.0 [230]
C2.00 [50.8]1.90 [48.3]2.10 [53.3]7.0 [175]10.0 [255]
SAll 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

ASTM A48 Cast Gray Iron Test Specimen

Dimensions, in [mm]Tension Test Specimen ATension Test Specimen BTension Test Specimen C
G-Length of parallel, min0.50 [13]0.75 [19]1.25 [32]
D-Diameter0.500±0.010 [13±0.25]0.750±0.015 [20±0.4]1.25±0.025 [30±0.6]
R-Radius of fillet, min1 [25]1 [25]2 [50]
A-Length of reduced section, min1-1/4 [32]1-1/2 [38]2-1/4 [57]
L-Over all length, min3-3/4 [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, min1/4 [6]1/4 [6]5/16 [8]
F-Diameter of shoulder5/8±1/64 [16±0.4]15/16±1/64 [24±0.4]1-7/16±1/64 [36±0.4]
B-Length of end sectionOptional 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.

castingquality.com
Similar Gray Iron Casting Grades in whole world:
www.castingquality.com

IndexCountryGrey Iron Grade
1ChinaHT350HT300HT250HT200HT150HT100
2JapaneseFC350FC300FC250FC200FC150FC100
3USANO.60NO.50NO.45NO.35/ NO.40NO.30NO.25NO.20
4RussiaCЧ40CЧ35CЧ30CЧ24/CЧ25CЧ18/CЧ20/CЧ21CЧ15CЧ10
5GermanyGG40GG35GG30GG25GG20GG15GG10
6ItalyG35G30G25G20G15G10
7FranceFGL400FGL350FGL300FGL250FGL200FGL150
8England400350300260180/220150100
9PolandZ140Z135Z130Z125Z120Z115
10IndiaFG400FG350FG300FG260FG200FG150
11RomaniaFC400FC350FC300FC250FC200FC150
12SpanishFG35FG30FG25FG20FG15
13BelgiumFGG40FGG35FGG30FGG25FGG20FGG15FGG10
14AustraliaT400T350T300T260T220T150
15SwedenO140O135O130O125O120O115O110
16HungaryOV40OV35OV30OV25OV20OV15
17BulgariaVch35Vch30Vch25Vch20Vch15
18ISO350300250200150100
19COPANTFG400FG350FG300FG250FG200FG150FG100
20Taiwan(CN)FC300FC250FC200FC150FC100
21HolandGG35GG30GG25GG20GG15
22LuxemburgFGG40FGG35FGG30FGG25FGG20FGG15
23AustriaGG35GG30GG25GG20GG15
24Europa-NormEN-GJL-350EN-GJL-300EN-GJL-250EN-GJL-200EN-GJL-150

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