ASTM A240 Type 420 contains increased carbon to improve mechanical properties. Typical applications include surgical instruments. SS 420 Plate is a hardenable, martensitic stainless steel that is a modification of SS 410 Plate.

Similar to SS 410 Plate, it contains a minimum of 12% chromium, just sufficient enough to give corrosion resistant properties. Available in different variations of carbon content 420 stainless steel plate is suitable for heat treatment. Stainless Steel 420 Plate has a 13% chromium content which gives the specification a level of corrosion resistance properties. British standard grades available are 420S29, 420S37, 420S45 Plate.

ASTM A240 Type 420 Applications:

Alloy 420 is used for a variety of applications where good corrosion and outstanding hardness is necessary. It is not suitable where temperatures exceeding 800°F (427°C) due to quick hardening and loss of corrosion resistance.

Needle valves
Cuttery
Knife blades
Surgical instruments
Shear blades
Scissors
Hand tools

Technical Data

Chemical Composition (%)

C	Mn	Si	P	S	Cr
0.15	1.00	1.00	0.04	0.03	12.0-14.0

Mechanical Properties

Tempering Temperature (°C)	Tensile Strength (MPa)	Yield Strength 0.2% Proof (MPa)	Elongation (% in 50mm)	Hardness Brinell (HB)
Annealed *	655	345	25	241 max
399°F (204°C)	1600	1360	12	444
600°F (316°C)	1580	1365	14	444
800°F (427°C)	1620	1420	10	461
1000°F (538°C)	1305	1095	15	375
1099°F (593°C)	1035	810	18	302
1202°F (650°C)	895	680	20	262
* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum.

Physical Properties

Density kg /m3	Thermal Conductivity W/mK	Electrical Resistivity (Microhm/cm)	Modulus of Elasticity	Coefficient of Thermal Expansion μm/m/°C	Specific Heat (J/kg.K)
7750	24.9at 212°F	550 (nΩ.m) at 68°F	200 GPa	10.3 at 32 – 212°F	460 at 32°F to 212°F

Equivalent Grades

USA/ Canada ASME-AISI	European	UNS Designation	Japan/JIS
AISI 420	DIN 2.4660	UNS S42000	SUS 420

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Shandong Chengshun Metal Materials Co., Ltd. is located in Jinan City, Shandong Province. It is a comprehensive company dealing in high-quality steel products, with a superior geographical location and very convenient transportation. The company has a complete and scientific quality system, and has been recognized by the industry for its integrity, strength and product quality.

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Mainly exported to Europe, Southeast Asia, South Africa, the Middle East, Latin America and other countries and regions, the products are favored by Chinese and foreign users.

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Stainless Steel Plate