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HG70 and LG600 are high-strength steel grades primarily used in engineering machinery and construction applications. HG70 is produced by WISCO (Wuhan Iron and Steel) and follows standards like WJX(ZB)02-2004 and GB/T16270, equivalent to grades such as Q690D/E/F (China) or EN S690Q/QL/QL1
|
Grade |
Full Name / Meaning |
Typical Standard / Category |
Description |
|---|---|---|---|
|
HG70 |
High-strength structural steel, 70 means yield ≥ 700 MPa (sometimes written as Q690 equivalent) |
Chinese high-strength low-alloy structural steel |
Used in heavy machinery, bridges, and high-strength welded structures |
|
LG600 |
Low-alloy high-strength steel, yield ≥ 600 MPa |
Often used in line pipe or pressure vessel steel grades (depends on manufacturer) |
Designed for toughness and weldability with slightly lower strength than HG70 |
LG600 is produced by LY Steel (Lianyuan Steel) and is part of their engineering machinery steel series, where the "600" indicates a minimum tensile strength of 600 MPa. Detailed mechanical properties for LG600 are limited in public sources, often requiring proprietary datasheets, while HG70 has more accessible data. Based on available information, HG70 generally exhibits higher strength metrics, making it suitable for more demanding load-bearing applications.
|
Element |
HG70 (Q690) |
LG600 |
|---|---|---|
|
C |
≤ 0.20% |
≤ 0.18% |
|
Mn |
1.0–1.6% |
1.0–1.5% |
|
Si |
0.20–0.60% |
0.20–0.60% |
|
P |
≤ 0.020% |
≤ 0.020% |
|
S |
≤ 0.015% |
≤ 0.015% |
|
Nb + V + Ti |
Microalloyed (≤ 0.10%) |
Microalloyed (≤ 0.08%) |
|
Cr + Mo + Ni |
Optional for strength improvement |
Optional for toughness improvement |
LG600 likely has a low-carbon, low-alloy composition optimized for weldability and toughness, but no exact values were found.
Public data for LG600 focuses on qualitative attributes: high strength, plasticity, toughness, stable performance, good formability, and weldability. Quantitative details are sparse, with the grade name implying a minimum tensile strength of 600 MPa. Yield strength is not specified but is expected to be in the 460–600 MPa range based on similar engineering steels from LY Steel. In contrast, HG70 has well-documented properties varying by thickness.
|
Property |
HG70 (10–50 mm thickness) |
HG70 (50–60 mm thickness) |
LG600 (Estimated/Qualitative) |
|---|---|---|---|
|
Yield Strength (MPa) |
≥590 |
≥570 |
Not specified; likely ≥460–550 (based on category) |
|
Tensile Strength (MPa) |
685–830 |
670–830 |
≥600 |
|
Elongation (%) |
≥17 |
≥15 |
High plasticity (not quantified) |
|
Impact Toughness (J) |
≥47 at -20°C |
≥47 at -20°C |
Good toughness (not quantified) |
|
Other |
Good bendability (d=3a); fatigue resistance |
Same as left |
Excellent weldability; wear resistance |
Key Differences and Applications
|
Aspect |
HG70 |
LG600 |
|---|---|---|
|
Carbon Equivalent (CE) |
~0.48–0.52 |
~0.42–0.46 |
|
Weld Preheat |
Required for thick plates |
Usually no preheat for <40 mm |
|
Cold Forming |
Limited (due to higher strength) |
Better forming capability |
|
Recommended Welding Wire |
ER80S-D2, E9018 |
ER70S-6, E8018 |
|
HG70 (High Strength) |
LG600 (Balanced Strength & Toughness) |
|---|---|
|
Heavy-duty cranes, mining equipment |
Pressure vessels |
|
Bridges, offshore structures |
Pipelines and transport tanks |
|
Shipbuilding, structural members |
Heavy trucks, low-temp service |
|
High-load welded structures |
General engineering steel components |
If more precise datasheets are needed, contacting the Gangsteel (WISCO for HG70, LY Steel for LG600) is recommended, as some properties may vary by production batch or specifications.
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