Hardness HRC 20–30

(1) Low Carbon Steel

1. Q195: Commonly used for bolts and nuts in construction engineering (HRC 22–24).

2. Q215: Commonly used for manufacturing light structural components (HRC 22–24).

3. Q235: Widely used for bridges, construction, and vehicle manufacturing (HRC 22–25).

4. Q275: Suitable for manufacturing high-strength components (HRC 22–25).

5. 08F: Commonly used for manufacturing automotive bodies and home appliances (HRC 22–24).

6. 10F: Suitable for cold-stamped parts, such as vehicle body panels (HRC 22–24).

7. 20F: Suitable for manufacturing gears and shafts (HRC 24–26).

8. 20: Commonly used for mechanical structural parts and standard parts (HRC 24–26).

(2) Medium Carbon Steel

1. 35: Suitable for manufacturing medium-load mechanical parts (HRC 25–28).

2. 45: Widely used for shafts, bolts, and gears (HRC 26–30).

3. 50: Suitable for high-strength bolts and springs (HRC 27–31).

4. 55: Commonly used for manufacturing high-strength mechanical parts (HRC 28–32).

5. 60: Suitable for heavy-duty shafts and high-strength gears (HRC 28–33).

(3) Low Alloy Steel

1. 15Mn: Suitable for manufacturing welded structures and vehicle parts (HRC 25–28).

2. 20Mn: Commonly used for high-strength welded structures (HRC 26–30).

3. 40Mn: Suitable for manufacturing medium-load mechanical parts (HRC 27–31).

4. 16Mn: Widely used for bridges and construction structures (HRC 28–32).

5. 20Mn2: Suitable for manufacturing medium-load gears and shafts (HRC 28–32).

6. 20Mn2TiB: Suitable for high-strength structural components and fasteners (HRC 28–32).

Hardness HRC 30–40

(1) Medium Carbon Steel

1. 65: Commonly used for high-strength springs and spring washers (HRC 30–34).

2. 70: Suitable for manufacturing high-strength bolts and springs (HRC 31–35).

3. 75: Suitable for high-strength structural parts and springs (HRC 32–36).

4. 80: Widely used for manufacturing high-strength wires and springs (HRC 33–37).

5. 85: Commonly used for manufacturing high-strength bolts and gears (HRC 34–38).

6. 90: Suitable for high-strength mechanical parts and gears (HRC 35–39).

7. 95: Suitable for high-strength shafts and gears (HRC 36–40).

8. 100: Commonly used for manufacturing high-strength springs and spring washers (HRC 36–40).

(2) Low Alloy Steel

1. 15Cr: Commonly used for manufacturing wear-resistant parts and tools (HRC 30–34).

2. 20Cr: Suitable for manufacturing gears and shafts (HRC 30–35).

3. 40Cr: Widely used for manufacturing shafts and gears (HRC 31–37).

4. 20CrMo: Suitable for manufacturing high-strength and wear-resistant parts (HRC 31–37).

5. 30CrMo: Suitable for manufacturing high-strength mechanical parts (HRC 32–37).

6. 35CrMo: Suitable for manufacturing high-strength and wear-resistant gears (HRC 33–38).

(3) Plastic Mold Steel

1. P20: Commonly used for manufacturing plastic molds and tools (HRC 32–34).

2. 718: Commonly used for manufacturing plastic molds (HRC 33–35).

3. S136: Suitable for manufacturing corrosion-resistant plastic molds (HRC 34–36).

4. 2316: Suitable for high-corrosion-resistant plastic molds (HRC 34–36).

5. 2738: Commonly used for large plastic molds (HRC 34–36).

6. 8407: Widely used for hot work molds and tools (HRC 34–38).

Hardness HRC 40–50

(1) Medium Alloy Steel

1. 35CrMnSiA: Suitable for manufacturing high-strength mechanical parts (HRC 42–46).

2. 50Mn2V: Suitable for manufacturing high-strength and wear-resistant parts (HRC 42–48).

3. 60Si2Mn: Commonly used for manufacturing high-strength springs (HRC 44–48).

4. 65Mn: Widely used for high-strength mechanical parts and springs (HRC 45–50).

5.  20CrNiMo: Widely used for manufacturing gears and shafts (HRC 40–45).

6. 12Cr1MoV: Commonly used for high-temperature, high-pressure boiler tubes and fittings (HRC 40–46).

7. 38CrMoAl: Suitable for manufacturing wear-resistant parts and shafts (HRC 42–46).

(2) Hot Work Tool Steel

1. H13: Commonly used for manufacturing hot work molds and tools (HRC 42–48).

2. H11: Suitable for manufacturing hot work molds and stamping tools (HRC 40–45).

(3) Martensitic Stainless Steel

1. 1Cr13: Suitable for manufacturing corrosion-resistant and high-strength parts (HRC 40–45).

2. 2Cr13: Commonly used for manufacturing knives and shafts (HRC 42–46).

3. 3Cr13: Suitable for manufacturing knives and mechanical parts (HRC 43–47).

4. 4Cr13: Suitable for manufacturing corrosion-resistant and high-strength parts (HRC 44–48).

Hardness HRC 50–60

(1) High Alloy Steel

1. 18Cr2Ni4WA: Widely used for manufacturing high-strength gears and shafts (HRC 55–60).

2. 20CrNi2MoA: Suitable for high-strength mechanical parts (HRC 52–57).

3. 40CrMnNiMo: Commonly used for manufacturing high-strength and wear-resistant parts (HRC 55–60).

(2) Cold Work Tool Steel

1. Cr12: Suitable for manufacturing cold work molds and tools (HRC 52–56).

2. D2: Suitable for manufacturing wear-resistant cold work molds (HRC 55–60).