C355

c355 ingot

C355.0 (5Si-1.3Cu-0.5Mg) Aluminum Alloy

  • AMS. 4210, 4212, 4214, 4280, 4281
  • Former ASTM. 355.0, SC51A; C355.0, SC51B
  • SAE. 322
  • UNS number. A03550, A33550
  • Government. QQ-A-601, QQ-A-596, MIL-C-21180
  • Foreign. ISO: CSA SC51, AC 4D, 3600, A-S4UG, EN AC-45300, Al-Si5Cu1Mg, LM 16
  • Description: C355 is commonly heat treated. We typically always use C355.2 aluminum alloy. Aluminum sand casting alloy 355 uses copper to greatly improve its strength over the more common aluminum casting alloy A356. The 355 aluminum alloy is great for pressure tight applications and the alloy also maintains its strength at higher temperatures than A356. The trade off is typically C355.2 is more expensive than 355.1. Consequence of exceeding impurity limits. High iron decreases ductility. Nickel decreases resistance to corrosion. Tin reduces mechanical properties.

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c355 ingot

Typical Properties & Characteristics of Aluminum Sand Castings

Typical Aluminum Alloys (a) ... Resistance to Corrosion (b) ... ... ... Typical Mechanical Properties
AA Former AA Designation ASTM Spec. No. Federal Spec. No. SAE Alloy No. Approx. Weight, lb./in.3 General Stress Corrosion Cracking Relative Machinability (c) Castability (k) Weldability (Arc) (d) Ultimate Tensile Strength, ksi (i) Yield Strength Tension, ksi (e) (i) Elongation, Percentage in 2 in. (Round Specimen, 1/2" Dia.) (f) (i) Shear Strength, ksi (g) Fatigue Endurance Limit, ksi (h) Brinell Hardness (500-kg Load, 10-mm Ball) (j)
355.0-T6 355 B26 ... 322 0.098 3 A 3 1 2 35 25 3 28 9 80
355.0-T7 355 B26 QQ-A-601 ... 0.098 3 A 3 1 2 38 36 0.5 38 10 85
C355.0-T6 C355 B26 ... ... 0.098 3 A 3 1 2 38 28 5 28 10 90

Designations and nominal compositions of common aluminum alloys used for sand casting
AA Number Former AA designations Former ASTM number Cu Mg Mn Si Others
C355.0 C355 SG51B 1.20 0.50 0.10 (Max) 5.00 0.60 Fe (Max), 0.35 Zn (Max)

Characteristics of common aluminum alloys used in sand casting
Alloy Fluidity Resistance to hot cracking Pressure tightness Heat Treatment Strength at elevated temperatures General corrosion resistance Machining Polishing Anodizing Appearance Weldability
C355.0 1 1 1 Yes 2 3 3 3 4 1

Alloy Uses
C355.0 Air-compressor fittings, crankcase, gear housings, hydraulic fittings

Typical Tensile Properties for separately cast test bars of comon aluminum casting alloys
Alloy Temper Tensile strength Yield strength Shear strength Compressive yield strength Elongation %
Mpa ksi Mpa ksi Mpa ksi Mpa ksi
355.0 T6 240 35 175 25 195 28 180 26 3
355.0 T7 265 38 250 36 195 28 260 38 0.5

 

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