Common Grade Of Steel For Fasteners-CBIES Fasteners
1). SWRCH= steel wire (rod) for cold heading, is Japanese steel, JIS G3507-2010 and Q/BQB517-2018 all have their grades and chemical composition specified.
SWRCH6A and SWRCH8A are suitable for the production of 3.6-4.6 standard and non-standard parts.
SWRCH10A is suitable for the production of 4.8-6.8 standard and non-standard parts.
SWRCH15A is suitable for producing all kinds of grade 4.8-6.8 fasteners and welding nails.
SWRCH18A, SWRCH22A is suitable for producing all kinds of medium and high strength self-tapping screws and standard parts of grade 8.8-10.9.
SWRCH35K, SWRCH40K, SWRCH45K are suitable for producing bolts and nuts of class 8.8-10.9.
Take SWRCH18A as an example, the meaning of letters and numbers: S- carbon steel, WR- wire, CH- cold-forged steel, 18- average carbon content 0.18%, A- deoxidization method, aluminum stabilized steel; Stabilized steel is completely deoxidized steel, oxygen content does not exceed 0.01% by mass.
2). SCM435 and SCM440H are Japanese standards JIS G4053 alloy steel for machinery manufacturing, also stipulated in Q/BQB517-2018. Corresponding to domestic steel 35CrMo and 42CrMo.
SCM435 and SCM440H are common steel grades for producing high strength fasteners of 10.9~12.9 grade, suitable for producing bolts and nuts of 10.9~12.9 grade.
This number is the Japanese standard number,
Take SCM440H as an example, the meaning of letters and numbers: SCM-Chromium-Molybdenum Steel: S-Steel Steel, C-Cr chromium, M-Mo Molybdenum, 4--molybdenum content of about 4%, 40- carbon content of about 0.40%, H- guarantee hardenability Steel.
3) ML20MnTiB is a common steel grade used in the production of 10.9-grade steel structure standard parts, which is suitable for the production of 10.9-grade various types of steel structure bolts. ML is the initials of riveted steel. It is stipulated in GB/T6478 "Steel for cold heading and cold extrusion".
This number is the NATIONAL standard number, ML-cold pier riveting screw steel, take the first letter of Riveting Screw Chinese pinyin, 20-average carbon content 0.20%, Mn-manganese, Ti-titanium, B-boron, three kinds of the alloy is less than 1.5%.
4). 10B21, 10B28, 10B33 are suitable for the production of various fasteners of grade 8.8 ~ 10.9, mainly used for the production of grade 8.8 ~ 10.9 standard parts. It is specified in CHEMICAL Composition of Carbon Steel, SAE J403-2014, and Q/BQB517-2018.
This serial number is an American standard, 10-carbon steel, B-boron steel, 21-average carbon content 0.21%.
5). ML35 is suitable for the production of 8.8 bolts, nuts, flange bolts, hex socket bolts and so on. In line with GB/T6478 "steel for cold heading and cold extrusion" specification. Equivalent to SWRCH35K.
6), 35VB is alloy structure steel, is the production of high-grade 10.9 steel structure bolt steel grade,
7). SCr420 and SCr440 are steel grades for producing 12.9-grade high strength fasteners; Alloy steel is Japanese standard JIS G4053 for machinery manufacturing steel, also stipulated in Q/BQB517-2018.
8). 70 steel, 65Mn, 60Si2Mn are suitable for the manufacture of elastic washer fasteners. Q235B35 and 45 sheets of steel are high-quality carbon steels for the manufacture of flat gaskets with different hardness requirements.
