At present, the fasteners on the market mainly include stainless steel, carbon steel, copper, aluminum alloy four kinds of raw materials.
1. Carbon steel. To carbon steel material in the composition of carbon to distinguish between low carbon steel, medium carbon steel, high carbon steel and its alloy steel.
(1) low carbon steel C% ≤ 0.25% China is generally called A3 steel. Other countries and regions are basically called 1008, 1015, 1018, 1022, etc.. Mainly used in 4.8 grade screws and 4 grade nuts, small screws and other goods without strength standards. (Note: Drill-tail screws are generally used 1022 raw materials.)
(2) medium carbon steel 0.25% 0.60%. Currently on the market basically no application of this material.
(3) alloy steel: in the ordinary carbon steel to add alloy components, adding some special characteristics to the construction steel: such as 35, 40 chromium-molybdenum, SCM435, 10B38. 12.9 grade screws using SCM435 chromium-molybdenum alloy steel, the key components are C, Si, Mn, P, S, Cr, Mo.
2. Stainless steel. Characteristic grade: 45, 50, 60, 70, 80. mainly divided into martensite (18% Cr, 8% Ni) good temperature resistance, good corrosion resistance. a1, a2, a4 martensite (13% Cr) weaker corrosion resistance, high strength, good wear resistance. c1, c2, c4430 stainless steel. 18% Cr upsetting is better, corrosion resistance is stronger than austenite. The current market raw materials are mainly divided into SUS302, SUS304, SUS316 by grade.
3. Copper. Common materials for brass, purple copper alloy. The market is generally used H62, H65, H68 copper for standard products.
4. aluminum alloy density is low, but the compressive strength is very high, close to or even more than heat-resistant cast iron, good plasticity, can be made into a variety of aluminum profiles, with good electrical conductivity, heat transfer and corrosion resistance, industrial use is very extensive, the amount of steel second only.
- Alloy steel also refers to chromium-molybdenum alloy steel, such as SCM435, etc.
Common raw materials for fasteners
(A) carbon steel, alloy steel, special steel category
1, bolts, screws, screws 3.6 grade, 4.6 grade, 4.8 grade, 5.6 grade, 5.8 grade, 6.8 grade general choice of carbon steel, no heat treatment process; 8.8 grade, 9.8 grade general choice of low carbon environmental alloy steel or medium carbon steel, quenched and tempered; 10.9 grade general choice of low and medium carbon alloy steel or alloy steel, quenched and tempered; 12.9 grade general choice of alloy steel, quenched and tempered. Tempering.
2, nuts 4, 5, 6 general choice of carbon steel, but also available easy to cut steel manufacturing, no heat treatment process; 8, 9, general choice of medium carbon steel, quenched and tempered; 10, 12 to enhance the physical properties, if necessary, can increase the alloy composition, quenched and tempered.
3、Fastening screws 14H generally choose carbon steel, no heat treatment process; 22H, 33H generally choose carbon steel, quenched and tempered; 45H generally choose alloy steel, quenched and tempered.
4、Flat pad HV140 generally choose low carbon steel; HV300 generally choose medium carbon steel, must heat treatment process.
5、Self-tapping screws/drill-tail nails are generally selected from medium carbon steel such as SWRCH22A, the surface layer must be carburized.
6, tooth-type, serrated lock washers, work-shaped, wave-shaped elastic washers are generally selected 65Mn
7, elastic washers are generally selected tool steel 70/65Mn/60Si2Mn, quenched and tempered.
8, the pin can generally choose carbon steel 35 #, quenched and tempered HRC28-38, 45 #, quenched and tempered HRC38-46; alloy steel 30CrMnSiA, quenched and tempered HRC35-41; special steel 1Cr13/2Cr13, Cr17.i2, 1Cr18.I9Ti
(B) stainless steel raw materials
Stainless steel material: stainless steel bolt material has Q215 and Q235 and 25 and 45 together with the steel material, the thread between the bolt in sometimes will need important coupling, then you can use 15Cr and 20Cr and so on and 30CrMri this steel alloy, so that the mechanical properties of the bolt will be improved. It contains 9 chemical composition, respectively ni, cu, c, s, si, p, mn, cr. stainless steel materials: 201, 304, 316, 304L, 316L, 2205 , 2507, 310S, 321 , 904L, 667 and so on.
Types of introduction: 302HQ where the main source is tapping nails; SUS304, A2 is another name for it, the main production material for stainless steel bolts, stainless steel screws, stainless steel washers and stainless steel nuts, the grade value of strength is slightly on the upper side; SUS316 and SUS316L, also known as A4, which is more corrosive than A2, stainless steel bolts, stainless steel screws, stainless steel washers, the Stainless steel nuts production, this strength grade value and A2 can be the same, but also can be a little stronger than A2.
Nanning Aozhan Hardware Fastener Co., Ltd. mainly produces and processes stainless steel bolts, stainless steel nuts, washers, self-tapping nails, drill-tail nails, etc. 10 years focus on customizing bolts and screws. If you want to know more about stainless steel fasteners, send an email to info@aozhanfasteners.com, we are happy to give you answers!
Post time: Sep-07-2022
