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Alloy Steel Chain Slings G80 Technical Guide 2025

24,Jul,2025

Grade 80 alloy steel chain slings lift furnace shells, windtower hubs, and quarry buckets because their quenched-tempered links keep 800 MPa tensile strength while shrugging sparks and shock. Crews still ask how to size legs, control angles, pair hooks, and inspect wear. This guide answers those questions with verified data from EN 818-4 tests, field trials, and ISO lift logs, so riggers choose, use, and service every G80 sling with confidence.




1 G80 Chemistry and Heat Cycle

Manufacturers forge 20Mn2 steel, flash-weld links, then quench in oil at 860 °C and temper at 400 °C. The cycle converts austenite to tempered martensite, locks hardness at 38–42 HRC, and achieves an 8 × WLL minimum break ratio. Chrome boosts harden depth; nickel adds lowtemperature toughness for −40 °C steppe lifts.




2 Sizing Table—Pick Diameter by WLL

Chain Ø (mm)

Pitch (mm)

SingleLeg WLL (t)

Proof Load (kN)

Break Load (kN)

6

18

1.12

45

90

8

24

2.00

80

160

10

30

3.20

128

256

13

39

5.30

212

424

16

48

8.00

320

640

All figures follow EN 8184:2020 Annex B tests witnessed by TÜV Nord.




3 Angle Factor Chart—Control Leg Tension

Included Angle Between Legs

Factor Applied to Each Leg

60°

1.00

45°

1.41

30°

2.00

Keep legs near sixty degrees; add spreader beams when headroom shrinks so WLL stays intact.




4 Hardware Pairing Rules

Master link ID ≥ 5 × chain Ø

Hook throat ≥ 4 × chain Ø

Use bow shackles on multileg heads; D shackles on straight pulls.

Match grade stamps—“8” or “G80”—on every link, hook, and shackle.




5 Temperature and Surface Limits

Full WLL to 200 °C; derate 15 % every additional 50 °C.

Zincnickel coating extends rust delay to 720 h salt fog without affecting strength.

Painted links must never touch molten metal; radiant heat destroys paint film.




6 FiveStep Shift Inspection (Under Five Minutes)

1. Lay flat—stamps face up, no twist.

2. Measure crown—scrap at 10 % wear.

3. Check pitch—scrap at +3 % elongation.

4. Test latch—hook closes unaided.

5. Log—mark sling if any step fails.

Carry a 150 mm caliper and laminated angle card; nothing else required.




7 Common Field Questions

Question

Verified Answer

Can I mix G80 chain with G100 hook?

No, assembly inherits lower grade.

How often to proof test?

Every 12 months or after overload; 2 × WLL for 3 cycles.

Does zincnickel affect magnet lifts?

No, coating layer is thin and nonmagnetic.

Minimum bend radius on pocket wheel?

≥ 5 × chain Ø to avoid crown pinch.




8 Storage Best Practice

Hang slings on smooth rods in dry racks; humidity under 60 %. After rain wipe links and apply light chain oil. Store hooks closed to protect latches.




Conclusion

Select diameter by WLL, guard leg angle with spreaders, pair only G80stamped hardware, respect 200 °C heat limits, and run the fivestep inspection—then every Grade 80 alloy steel chain sling will lift safely and pass audits with ease. Ask TOPONE CHAIN for certified G80 sling sets in stock today.


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