Although there are many types of tapping screws, they all have the following similarities: Name of product specification Materials Steel factory / origin Today's price (yuan/ton) Yesterday's price (yuan/ton) Change (yuan/ton) Welded pipe 6 points/2.5mm Q235 Youfa 3770-3780 3770-3780 constant Welded pipe 1 inch/3.0mm Q235 Youfa 3680-3690 3680-3690 constant Welded pipe 1.5 inch/3.25mm Q235 Youfa 3680-3690 3680-3690 constant Welded pipe 4 inch/3.75mm Q235 Youfa 3650-3660 3650-3660 constant Welded pipe 6 inch/4.0mm Q235 Youfa 3750-3760 3750-3760 constant Welded pipe 1 inch/3.0mm Q235 Lida 3850-3860 3850-3860 constant Welded pipe 1.5 inch/3.25mm Q235 Lida 3780-3790 3780-3790 constant Welded pipe 3 inch/3.0mm Q235 Lida 3740-3750 3740-3750 constant Welded pipe 8 inch/5.0mm Q235 Lida 4010-4020 4010-4020 constant Seamless tube 76*4.5 20# Tianjin 4650-4700 4650-4700 constant Seamless tube 108*4.5 20# Tianjin 4700-4750 4700-4750 constant Seamless tube 114*4.5 20# Angang 4800-4850 4800-4850 constant Seamless tube 159*5 20# Angang 4700-4750 4700-4750 constant Seamless tube 219*8 20# Angang 4800-4850 4800-4850 constant Seamless tube 377*10 20# Baogang 6200-6250 6200-6250 constant Seamless tube 426*12 20# Baogang 6300-6350 6300-6350 constant
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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