Plain carbon steel Approximately 0.45–0.90% carbon | About 50–58 HRC for a working edge | Good | Good to very good when tempered correctly | Low; can rust without protection | Easy to moderate | General cold chisels, masonry work, basic metal cutting, and budget tools | Less wear-resistant and less consistent than alloy tool steels |
Chrome-vanadium steel Cr-V alloy tool steel | About 52–58 HRC for many striking chisels | Good to very good | Very good; suitable for repeated impacts | Low to moderate | Moderate | The best all-round choice for general-purpose striking and cold chisels | Not stainless; excessive hardness can cause edge chipping under severe impact |
Chrome-molybdenum steel Cr-Mo alloy tool steel | About 52–60 HRC, depending on grade and tempering | Very good | Very good, with strong resistance to shock and deformation | Low to moderate | Moderate | Heavy-duty automotive, mechanical, and impact applications | Performance depends strongly on heat treatment; usually costs more than plain carbon steel |
| O1 oil-hardening tool steel | About 58–62 HRC | Very good | Good, but lower than softer striking-steel formulations | Low; requires regular oiling | Moderate | Woodworking chisels and applications requiring a keen, durable edge | Can chip if used for heavy hammering or on hard, abrasive materials |
| A2 air-hardening tool steel | About 58–62 HRC | Very good to excellent | Good; generally tougher than high-wear D2 at similar hardness | Low to moderate | Moderate to difficult | Premium woodworking chisels and long-lasting general cutting edges | More difficult to sharpen than simpler carbon steels and not fully stainless |
| D2 high-carbon, high-chromium tool steel | About 58–62 HRC | Excellent | Moderate; less forgiving under heavy shock | Moderate; corrosion-resistant but not stainless | Difficult | Abrasive materials and applications where maximum wear resistance matters | Higher risk of chipping or cracking during severe impacts |
High-speed steel HSS | About 60–68 HRC | Excellent at elevated temperatures | Low to moderate for striking use | Low to moderate | Very difficult | Specialized cutting tools and scraper-style applications, not routine hammering | Too brittle for most impact chisels and difficult to regrind |
| Martensitic stainless steel | About 54–60 HRC, depending on grade | Good | Moderate to good | Good; superior to ordinary carbon and low-alloy steels | Moderate | Damp environments, food-related work, and users prioritizing rust resistance | Usually gives up some toughness or edge stability compared with dedicated tool steels |