Although there are many types of tapping screws, they all have the following similarities: Name of product specification Materials Steel factory / origin Price (yuan/ton) Than yesterday Compared to last week Than last month Common line Φ6.5mm Q235 Handan Iron and Steel 3690 -100 -190 360 Common line Φ6.5mm Q235 Wine and Steel 3690 -100 -190 360 altitude Φ6.5mm Q235 Ping Gang 3740 -80 -210 390 altitude Φ6.5mm Q235 Beitai 3740 -80 -210 400 altitude Φ6.5mm Q335 Haixin 3740 -90 -210 380 Rebar Φ12mm HRB335 Baosteel 3590 -10 -50 220 Rebar Φ14mm HRB335 Baosteel 3490 -30 -70 180 Rebar Φ16mm HRB335 Baosteel 3430 -40 -80 130 Rebar Φ18-25mm HRB335 Baosteel 3430 -40 -80 130 Rebar Φ12-14mm HRB335 Shanghai Bao 3430 -30 -120 200 Rebar Φ18-25mm HRB335 Shanghai Bao 3320 -40 -130 110 Rebar Φ16-25mm HRB335 Tang Gang 3320 -40 -130 110 Rebar Φ16-25mm HRB335 2672 3330 -40 -130 110 Rebar Φ16-25mm HRB335 Handan Iron and Steel 3340 -40 -130 110 Rebar Φ16-25mm HRB335 Lai Gang 3330 -40 -130 110 Rebar Φ20-25mm HRB335 Beitai 3320 -40 -130 110 Rebar Φ20-25mm HRB335 Yinfeng 3320 -50 -130 110 Grade III rebar Φ10mm HRB400 Baosteel 3840 0 -10 310 Grade III rebar Φ12mm HRB400 Baosteel 3740 0 -10 310 Grade III rebar Φ14mm HRB400 Baosteel 3740 0 -10 350 Grade III rebar Φ16mm HRB400 Baosteel 3520 -40 -50 180 Grade III rebar Φ20mm HRB400 Baosteel 3520 -40 -50 180 Grade III rebar Φ12-14mm HRB400 Ma Gang 3710 0 -70 310 Grade III rebar Φ16mm HRB400 Ma Gang 3450 -60 -120 90 Grade III rebar Φ20mm HRB400 Ma Gang 3450 -60 -120 90 Grade III rebar Φ25mm HRB400 Ma Gang 3450 -60 -120 80 Grade III rebar Φ28-32mm HRB400 Ma Gang 3610 0 -60 190
(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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