Alloy Steel Bars for Special Application Bolting Materials

Product Applications

SNB23

SNB21 is a type of steel for bolts and is a standard materia

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SNB23

SNB21 is a type of steel for bolts and is a standard material made of chrome molybdenum vanadium steel. According to overseas standards, ASTM A 540-B 21 is an equivalent product and material. Originally, the standard was designed for use in nuclear facilities such as nuclear reactors, so the material standard is also distinct from the steel materials used for other general-purpose bolts. From the carbon content, it is a steel material that corresponds to hard steel, and vanadium is added to the only four bolt materials for special purposes. This is an element that improves wear resistance, as is familiar with tool steel.

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SNB21

"SNB22 is a steel bar for bolts based on chrome molybdenum s

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SNB21

"SNB22 is a steel bar for bolts based on chrome molybdenum steel, which is a JIS standardized material. There are 5 types of materials, SNB22-1, SNB22-2, SNB22-3, SNB22-4, and SNB22-5, because they are further differentiated from No. 1 to No. 5 by their mechanical properties. Some overseas standards are equivalent to ASTM A 540-B 22 and AISI 4142H.

According to JIS, there are two types, and among the four types of bolt steel materials of the same system, the diameter size is smaller. It is the only special purpose bolt material derived from chromoly steel, and the minimum steel bar of 38 mm or less will have a tensile strength of 1140 MPa or more. Yield strength also in this case. 1080MPa is the minimum value."

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SNB22

SNB23 is a steel bar for bolts made from nickel-chromium-mol

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SNB22

SNB23 is a steel bar for bolts made from nickel-chromium-molybdenum steel and is one of the materials standardized by JIS. There are 5 materials, SNB23-1, SNB23-2, SNB23-3, SNB23-4, and SNB23-5. ASTM A 540-B 23 and AISI E-4340H are the equivalents of the overseas standards. There is also a stipulation for the Charpy impact absorption energy measured in an environment of -12°C, and you can see the minimum value of how much impact you can withstand.

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SNB24

SNB24 is one of the steel material standards for manufacturi

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SNB24

SNB24 is one of the steel material standards for manufacturing high-strength bolts intended for use in nuclear reactors and nuclear power plants, and is made of nickel-chromium-molybdenum steel AISI 4340, ASTM A 540-B 24 JIS version of standard materials such as. Since it is a material with high strength, impact value, and yield point (proof strength), it is rarely used for general purpose bolts. There are four types of special-purpose alloy steel bolt materials with a larger size range.

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Steel data

Standard Code Spec No. Material No. Mark
JIS G4108 SNB21-2
JIS G4108 SNB21-3
ASTM A540 Gr.B21-3
DIN 17240 1.7711 40CrMoV4-7
JIS G4108 SNB22-1
ASTM A540 Gr.B22-1
JIS G4108 SNB22-4
ASTM A540 Gr.B22-4
DIN 17240 1.7225 42CrMoV4
JIS G4108 SNB23-2
ASTM A540 Gr.B23-2
JIS G4108 SNB23-4
ASTM A540 Gr.B23-4
JIS G4108 SNB23-5
DIN 17242 1.6562 40NiCrMoV7-3
(C)% (Si)% (Mn)% (P)% (S)% (Ni)% (Cr)% (Mo)% (V)% Diameter(mm) Yield strength(Mpa) Tensile strength(Mpa) Elongation(%) Hardness(HB)
0.36~0.44 0.2~0.35 0.45~0.7 ≦ 0.025 ≦ 0.025 0.8~1.15 0.5~0.65 0.25~0.35 ≦ 100 ≧ 960 ≧ 1,070 ≧ 11 311~401
0.36~0.44 0.2~0.35 0.45~0.7 ≦ 0.025 ≦ 0.025 0.8~1.15 0.5~0.65 0.25~0.35 ≦ 75 ≧ 890 ≧ 1,000 ≧ 12 293~352
0.36~0.44 0.15~0.35 0.45~0.7 ≦ 0.025 ≦ 0.025 0.8~1.15 0.5~0.65 ≦ 75 ≧ 896 ≧ 1,000 ≧ 12 293~352
0.35~0.45 0.2~0.35 0.45~0.7 ≦ 0.04 ≦ 0.04 0.8~1.2 0.5~0.7 0.25~0.35
0.39~0.46 0.2~0.35 0.65~1.1 ≦ 0.025 ≦ 0.025 0.75~1.2 0.15~0.25 ≦ 38 ≧ 1,030 ≧ 1,140 ≧ 10 321~401
0.39~0.46 0.15~0.35 0.65~1.1 ≦ 0.025 ≦ 0.025 0.75~1.2 0.15~0.25 ≦ 38 ≧ 1,034 ≧ 1,138 ≧ 10 321~401
0.39~0.45 0.2~0.35 0.65~1.1 ≦ 0.025 ≦ 0.025 0.75~1.2 0.15~0.25 25~100 ≧ 825 ≧ 930 ≧ 13 269~341
0.39~0.45 0.15~0.35 0.65~1.1 ≦ 0.025 ≦ 0.025 0.75~1.2 0.15~0.25 25~100 ≧ 827 ≧ 930 ≧ 13 269~341
0.3~0.45 0.15~0.4 0.5~0.8 ≦ 0.035 ≦ 0.035 0.9~1.2 0.15~0.3 16~40 765~980 980~1,180 ≧ 11 540~680
0.37~0.44 0.2~0.35 0.6~0.95 ≦ 0.025 ≦ 0.025 1.55~2 0.65~0.95 0.2~0.3 ≦ 75 ≧ 960 ≧ 1,070 ≧ 11 311~388
0.37~0.44 0.15~0.35 0.6~0.95 ≦ 0.025 ≦ 0.025 1.55~2 0.65~0.95 0.2~0.3 ≦ 75 ≧ 965 ≧ 1,069 ≧ 11 311~388
0.37~0.44 0.2~0.35 0.6~0.95 ≦ 0.025 ≦ 0.025 1.55~2 0.65~0.95 0.2~0.3 ≦ 75 ≧ 825 ≧ 930 ≧ 13 269~341
0.37~0.44 0.15~0.35 0.6~0.95 ≦ 0.025 ≦ 0.025 1.55~2 0.65~0.95 0.2~0.3 ≦ 75 ≧ 827 ≧ 931 ≧ 13 269~341
0.37~0.44 0.2~0.35 0.6~0.95 ≦ 0.025 ≦ 0.025 1.55~2 0.65~0.95 0.2~0.3 ≦ 150 ≧ 715 ≧ 820 ≧ 15
0.37~0.44 0.2~0.35 0.7~0.9 ≦ 0.025 ≦ 0.025 1.65~2 0.7~0.95 0.3~0.4 ≧ 248