US type Welded G30 Proof Coil Chain
Grade 30 proof coil chain is a type of welded link chain and general purpose chain of normal commercial quality. Constructed from low carbon steel. Proof coil chain doesn’t have a uniform pitch and does not work with windlasses. It is hallmarked approximately every foot with the manufacturer’s symbol and grade marking: 3, 30 or 300. The typical uses of G30 proof coil chain include barrier chains, trailer safety chains, light construction, marine industry, etc. Please be noted that G30 proof coil chain should not be used for lifting applications. Wristrong G30 proof coil chains are manufactured acc. to the requirements regulated by ASTM in1980, NACM in 1990, 1996, 2003. We can also supply relevant lifting components to meet your detailed usages.
Advantage: Sample available(To check quality), Customized design(logo stamping), Different packaging(jute bag, plastic wheel, iron drum, wooden case), Short lead time, Multiple payment method(T/T, LC, Paypal, Alipay).
Model Number: G30 Proof Coil Chain
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Cautions:
Chains must not be used in chain slings.
Never use overload.
1:FORMING: Link shape and V notch check required during the full procedure. Dimensions check required.
2:WELDING: The weld was produced using the resistance butt processes and positioned in the centre of one leg of the link. It was smoothly finished all round. The links and welds shall not show fissures, notches or similar faults that are detrimental to the chain after welded. The diamater of the material at the weld was nowhere exceed the dimenstions requirements and not.less than the diameter of the material of the link.For smooth welded chain, fins caused by welding will be removed and the weld will be smoothly finished all round. The positioning of the weld at the centre of the straight barrel and the tolerances imposed on protrusions at the weld will provide the required clearances.
3:CALIRATING: Dimension check required for each calibration. Proof load on calibration shall be record for each batch.
4:MARKING: Chain Calibration Machine. Tow series available for 5mm to 16mm chain diameter marking/stamping. One key start. Adopt PCC control system with automatic-stop function when encounter fault, Reasonable mould design. Add self-weight function for the machine to increase the operational stability.
Pneumatic marking system which can also mark on two links at the same time.
5:HEAT TREATMENT: All the chain has been intermediate-frequency heat treated, it was hardened from a temperature above the AC3 point and tempered before being subjected to the manufacturing proof force. The termpering conditions was at least as effective as a temperature of 400°C maintained for a period of 1 hour. When proposed for verification, sample chains has be tested after they have been reheated to and maintained for 1 hour at 400°C and then cooled to room temperature.( AS 2321:2014 required the chain to be tempered in temperature at least 200°C for V200 and 380°C for V400).
