Topone's G80 lifting chain was the first—and, to this day, the sole—Chinese-round-link slings line to get through TÜV Rheinland's full Type Examination + Factory Surveillance program. Six months of unstinted audits confirmed every heat of 23MnNiCrMo-alloy steel, every flash-butt weld, and every proof-load trace. The result is a chain that resists hidden brittle zones, supports shock, and arrives with a digital EN 10204-3.1 certificate already in your email inbox.

From Furnace to Hook—Why This Chain Will Not Fail

Metallurgy & Weld Integrity Low-carbon Cr-Ni-Mo steel (C ≤ 0.25 %) quenches to fine martensite, tempers to 35–45 HRC. Links stretch over 15 % elongation prior to necking and retain 42 J impact toughness at −20 °C. Flash-butt welds penetrate ≥ 95 % of bar diameter; 100 % of them pass magnetic-particle scans.

TÜV Process Control Bots track hardness, quench time, and temper temperature in real time; TÜV inspectors grab random samples for independent tensile, Charpy, and micro-etch testing. Both process and product only meet target before the blue-octagon sticker ends up on the tag.

How to use it Add weight of rigging to design load, multiply by sling-angle factor from EN 818-4, then choose first diameter whose WLL is equal to or greater than that figure—no padding, no guesswork.

Service Life Locked In by Design

Proof Tested, Not Just Promised Each metre 2.5 × WLL without permanent stretch.

Traceable throughout the entire life of the Chain Embossed "8 – TPN" with heat & batch number every ≤ 10 m.

Weather-Ready Optional 70 µm hot-dip zinc gives 1 000 h neutral-salt spray; painted or phosphate coatings protect the rest of the range.

Two-Minute Field Inspection Caliper mid-link Ø (retire at −10 %), tape five-link pitch (scrap at +3 %), lamp scan for cracks—done before next lift.

Fail-Proof, Audit-Proof, Downtime-Proof

A twice-tested chain—our robots initially, then TÜV Rheinland—gives you the 800 MPa steel strength, the 15 % elongation ductility, the 95 % weld penetration reliability, and the documents to silence any inspector. Buy Topone G80 lifting chain certified by TÜV and lift every load with no second thought.