3Cr13 Steel vs AISI 420 Steel: What’s the Difference?

What is 420HC stainless steel?

AISI 420 is a high-carbon, martensitic stainless steel featuring at least 12% chromium, balancing moderate corrosion resistance with high hardness and strength. It is commonly used for cutlery, surgical instruments, plastic molds, and pump shafts due to its excellent wear resistance and ability to hold a sharp edge.

 

What is 3Cr13 steel equivalent to?

3Cr13 steel is a Chinese budget-friendly martensitic stainless steel primarily equivalent to AISI 420J2 (US standard), as well as AISI 420, DIN X30Cr13, and SUS420J2. It is known for good corrosion resistance and is often used for kitchen knives, scissors, and EDC tools, with a typical hardness of 52-56 HRC.

Region	Standard	Grade Designation
USA	ASTM / AISI	AISI 420
China	GB/T	3Cr13 (New: 30Cr13)
Germany	DIN / EN	1.4028 / X30Cr13
Japan	JIS	SUS420J2
Europe	EN	X30Cr13

 

3Cr13 Steel vs AISI 420 Steel: What's the Difference?

3Cr13 and AISI 420 (often 420J2) are similar martensitic stainless steels, but 420 generally offers slightly higher carbon and chromium levels, resulting in better hardness, wear resistance, and corrosion resistance. 3Cr13 is a popular, budget-friendly Chinese equivalent (0.3% carbon) often used for cutlery, while 420 (0.15–0.36% carbon) is a standard global grade.

 

3Cr13 Steel vs AISI 420 Steel: Chemical Composition Comparison (%)

The primary difference lies in the specific control of carbon content. 3Cr13 is a Chinese standard (GB/T), while AISI 420 is the American standard (ASTM).

Element	3Cr13 (GB/T 1220)	AISI 420 (ASTM A276)
Carbon (C)	0.26 – 0.35	0.15 min (usually 0.15 – 0.40)
Chromium (Cr)	12.00 – 14.00	12.00 – 14.00
Manganese (Mn)	≤ 1.00	≤ 1.00
Silicon (Si)	≤ 1.00	≤ 1.00
Phosphorus (P)	≤ 0.040	≤ 0.040
Sulfur (S)	≤ 0.030	≤ 0.030
Nickel (Ni)	≤ 0.60 (Optional)	≤ 0.75 (Optional)

 

3Cr13 Steel vs AISI 420 Steel: Mechanical & Physical Properties (Typical)

Values may vary based on the heat treatment (Quenching and Tempering) temperatures.

Property	3Cr13 (Hardened)	AISI 420 (Hardened)
Hardness (HRC)	52 – 55 HRC	50 – 54 HRC
Density (g/cm³)	7.75	7.80
Tensile Strength (MPa)	≥ 735	≥ 650 – 850
Yield Strength (MPa)	≥ 540	≥ 350 – 550
Elongation (%)	≥ 12	≥ 8 – 15
Thermal Conductivity	24.9 W/m·K	24.9 W/m·K

 

3Cr13 Steel vs. AISI 420 Steel: Corrosion Resistance

Both 3Cr13 and AISI 420 stainless steels offer moderate corrosion resistance. 3Cr13 typically has a slightly higher carbon content and a similar chromium content, resulting in good corrosion resistance in humid and mildly corrosive environments. However, AISI 420 (especially 420J2) generally exhibits more stable corrosion resistance after proper heat treatment and polishing, particularly in applications involving water or food contact.

3Cr13 Steel vs. AISI 420 Steel: Hardness/Strength

3Cr13 steel typically achieves a hardness of HRC 52-55 after heat treatment, while AISI 420 steel's hardness varies between HRC 48-56 depending on the grade (420J1 and 420J2). Due to its slightly higher carbon content (approximately 0.26%-0.35%), 3Cr13 steel has higher peak hardness and tensile strength, making it more suitable for applications requiring higher wear resistance.

3Cr13 Steel vs. AISI 420 Steel: Machinability

Both steels exhibit relatively good machinability in the annealed state. 3Cr13 steel typically offers approximately 55% to 60% machinability (compared to AISI 1212 steel), while AISI 420 steel, due to its higher hardness after some heat treatments, has slightly lower machinability, around 50% to 55%.

 

3Cr13 Steel vs. AISI 420 Steel: Edge Retention

Edge retention is closely related to hardness and carbide structure. Because 3Cr13 steel has higher hardness, it generally exhibits better edge retention in practical tool applications, maintaining sharpness for a longer period even with repeated use. AISI 420 steel (especially 420J2) has a lower carbon content (approximately 0.15% to 0.30%), resulting in fewer carbides. Therefore, its edge retention is slightly lower, but it is tougher and easier to grind.

 

3Cr13 Steel vs. AISI 420 Steel: Weldability

Both 3Cr13 and AISI 420 are martensitic stainless steels, meaning their weldability is limited and requires strict control. Preheating to 200–300°C and post-weld heat treatment (PWHT) are typically required to prevent cracking. AISI 420 generally has slightly better weldability due to its more controlled composition and higher degree of industrial standardization. In contrast, 3Cr13 may be more prone to cracking if welding parameters are not strictly controlled. For critical applications, welding is often avoided in favor of machining or forging.

 

3Cr13 Steel vs AISI 420 Steel: Which is better?

If you need an affordable, durable blade with moderate hardness for everyday tasks, choose 3Cr13 steel. If you need stronger rust resistance, especially for use in humid or corrosive environments, choose 420 (or 420HC) steel.

 

GNEE's 3Cr13 and AISI 420 steels are produced using an electric arc furnace (EAF) + LF refining + vacuum degassing (VD) process, effectively controlling the content of impurities such as sulfur and phosphorus, and improving the steel's impact toughness and polishing performance. All steels come with original manufacturer quality control (MTC) reports, ensuring that their chemical composition and mechanical properties meet international standards.

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GNEE supplies a wide range of products compliant with GB/T (3Cr13), ASTM (AISI 420), EN (1.4028), and JIS (SUS420J2) standards.

Product Form	Description / Specifications
Sheets & Coils	Available in hot rolled (No.1) and cold rolled (2B, BA, No.4, Mirror) finishes; thickness range from 0.3 mm to over 100 mm
Steel Bars	Round, square, and hex bars; available in black surface or precision bright (ground) condition
Pipes / Tubes	Seamless and welded pipes; mainly used for corrosion-resistant bearings and hydraulic components
Precision Strips	High-precision narrow strips; widely used for precision stamping of knives and gaskets