Common Metal Material Codes

Common Metal Material Codes.

Common metals such as carbon steel, aluminum, titanium, and stainless steel each have distinct properties.

1. Steel Products (GB/T 221)

1) Carbon Structural Steels

• Q235: Carbon structural steel, yield strength 235MPa
• Q355: High-strength low-alloy steel

2) High-quality Carbon Steels

• Grade 20 Steel: Low carbon steel
• Grade 45 Steel: Medium carbon steel (most commonly used)
• 65Mn: Spring steel

3) Alloy Structural Steels

• 40Cr: Chromium alloy steel
• 20CrMnTi: Carburizing gear steel

4) Stainless Steels

• 304 (0Cr18Ni9): General-purpose stainless steel
• 316 (0Cr17Ni12Mo2): Molybdenum-bearing stainless steel, better corrosion resistance
• 420 (2Cr13): Stainless steel for cutters and dies

5) Tool & Die Steels

• P20: Plastic mold steel
• H13 (4Cr5MoSiV1): Hot work die steel
• Cr12: Cold work die steel

6) Cast Iron

• HT150 / HT200 / HT250: Gray cast iron
• QT450-10: Ductile iron (nodular cast iron)

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2. Non-ferrous Metals

1) Aluminum & Aluminum Alloys

• 1050 / 1060: Pure aluminum
• 6061: General-purpose Al-Mg-Si alloy
• 7075: High-strength aerospace aluminum alloy

2) Copper & Copper Alloys

• T2: Pure copper (red copper)
• H62: Brass (copper-zinc alloy)
• QSn6.5-0.1: Tin bronze

3) Titanium Alloys

• TA1 / TA2: Pure titanium
• TC4 (Ti-6Al-4V): Most widely used titanium alloy

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