February 13, 2020

Gray Iron in ASTM A126

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

Our Services

  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

    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.

  4. CNC Machining

    CNC Milling, CNC turning with 5 xix CNC center, we provide precision machining for all castings based on customers design drawings.

  5. CAD Design

    Mechanical Design service based on customers requirement, our software is Solidworks and AutoCAD.

  6. 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 GradeTensile Strength, min
ksiMpa
ASTM A126 Class A21145
ASTM A126 Class B31214
ASTM A126 Class C41283

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 GradeForce at center, minDeflection at center, min
LbkNInmm
ASTM A126 Class A22009.750.102.5
ASTM A126 Class B330014.650.123.0
ASTM A126 Class C400017.750.123.0

Chemical Requirements in ASTM A126 standard, only P and S content:

Casting GradeChemical Analysis
P, %, maxS, %, max
ASTM A126 Class A0.750.15
ASTM A126 Class B0.750.15
ASTM A126 Class C0.750.15

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 GradeC,%Si,%Mn,%P ≤,%S≤,%Gray Iron Hardness (HBS)
Class AHT1503.3-3.52.0-2.40.5-0.80.20.12150-200
Class BHT2503.2-3.51.6-2.00.7-0.90.150.12190-240
Class CHT3002.9-3.21.4-1.70.8-1.00.150.12210-260

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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