Comparison of Steel Standards, CNS, JIS, AISI, ASTM, and DIN

Knowing the properties of alloy steel and other materials is essential for precision metal processing. Prior to beginning mass manufacturing of any OEM/ODM metal component, the Tien-I team concentrates on determining the customer’s requirements. We propose alloy steel after analyzing the processing cost effectiveness of alloy steel.

Therefore, the worldwide standards for alloy steel serve as the basis for this enterprise. Below is a broad overview of the topic.

1. National Standard in China (CNS)

The majority of the Chinese National Standard (CNS) coding for steel materials is derived from CNS 109 G1001 (published March 1947; edited March 1996).

Essentially, there are three sections to this.

• (1) The first section relates to the subject matter. Stainless material is often denoted by the letters S (Steel) or F. (Ferrum).
• (2) The second section has two components:
• a) Common name or product use. P = Plate; T = Tube; U = Utilization; W = Wire; F = Forging; C = Casting. Example: S P CC signifies plate, steel plate (cold); SUP denotes Use Spring, Spring Steel.
• b) Stainless material used for construction (including structural carbon steel or alloy steel) primarily expressed as carbon content or alloy element (structural carbon steel). Typically, 100 multiples of carbon content are used for denoting carbon content. SCM42 = Cr-Mo steel, type 420; S25C = carbon steel, 0.25 percent carbon content
• (3) The third portion specifies the type number, which is often a three-digit number representing the material’s lowest resistance strength or yield strength. SCM 420, for instance, refers to the material type number 420 for CR-MO steel.

2. Japanese Industrial Standard (JIS)

The Japanese Industrial Standard (JIS) steel material number is primarily separated into two types:

• (1) General Mechanical structure carbon steel. The material number is identical to that of CNS. Example: S30C refers to carbon steel with a carbon content of 0.30 percent.
• (2) Other applications for carbon and alloy steels This kind of material code is separated into three sections.
• a) The first portion signifies matter. Example: S = steel; F = iron indicates F. For further non-steel materials, see Table 11.
• b) The second component indicates steel specification or application. K is tool steel, TB is boiler pipe, while PC2 is cold-rolled steel.
• c) The third section indicates the kind of steel material, denoted by 1; 2; 3. The material processing procedure (such as heat treatment), if required, is included at the conclusion. D = Drawing, G = Grinding, T = Turning, and Ex = Extrusion. Typically, heat treatment is shown below the metal symbol or between two items.

SKS11 = 11th kind of cutting tool steel; SUH301 = 301st type of heat-resistant steel; SUS301-1/2H = 301st type of stainless steel, 1/2 hard substance.

– The Society of Automotive Engineers (AISI-SAE)

Steel material was classified in 1941 by the American Iron and Steel Institute (AISI) and the Society of Automotive Engineers (SAE). Four- or five-digit numerals are used to indicate types.

• (1) The first number indicates the steel type. Example: 2 = nickel steel; 7 Means tungsten steel.
• (2) The second number is the primary percentile of the alloy. (When no additional alloy component is present, this is represented as a zero)
• (3) The third and fourth figures indicate the amount of carbon present.

Source: https://www.tien-i.com/blog_detail/27-steel-standard-comparison-cns-jis-aisi-astm-din