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Grain-oriented steel Transformer cores Processing capability
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Grades and data

Grain-oriented electrical steel grades

Mill grades: Hunan LY Steel Electromagnetic Material Co., Ltd. (Lysteel, LG/L series). Values follow the mill product handbook; every delivery ships with the mill certificate.

Product seriesThickness (mm)Width (mm)Inner diameter (mm)Coil weight (t)
High-permeability series (QG)0.30 · 0.27 · 0.23 · 0.20 · 0.18900–12505082–5
Domain-refined series (QH)0.30 · 0.27 · 0.23 · 0.20 · 0.18900–12505082–5
High-permeability series (QG)
GradeThickness (mm)Max core loss P1.7/50 (W/kg)Min J800 (T)Min stacking factor
LG30QG0950.300.951.880.960
LG30QG1000.301.001.880.960
LG30QG1050.301.051.880.960
LG30QG1200.301.201.880.960
LG27QG0900.270.901.880.955
LG27QG0950.270.951.880.955
LG27QG1000.271.001.880.955
LG27QG1100.271.101.880.955
LG23QG0800.230.801.880.950
LG23QG0850.230.851.880.950
LG23QG0900.230.901.880.950
LG23QG0950.230.951.880.950
LG23QG1000.231.001.880.950
LG20QG0750.200.751.880.950
LG20QG0800.200.801.880.950
LG20QG0850.200.851.880.950
LG20QG0900.200.901.880.950
LG20QG0950.200.951.880.950
LG18QG0750.180.751.880.950
LG18QG0800.180.801.880.950
LG18QG0850.180.851.880.950
LG18QG0900.180.901.880.950
Domain-refined series (QH)
GradeThickness (mm)Max core loss P1.7/50 (W/kg)Min J800 (T)Min stacking factor
LG30QH0900.300.901.880.960
LG30QH0950.300.951.880.960
LG30QH1000.301.001.880.960
LG30QH1050.301.051.880.960
LG27QH0800.270.801.880.955
LG27QH0850.270.851.880.955
LG27QH0900.270.901.880.955
LG27QH0950.270.951.880.955
LG27QH1000.271.001.880.955
LG23QH0750.230.751.880.950
LG23QH0800.230.801.880.950
LG23QH0850.230.851.880.950
LG23QH0900.230.901.880.950
LG20QH0650.200.651.880.950
LG20QH0700.200.701.880.950
LG20QH0750.200.751.880.950
LG20QH0800.200.801.880.950
LG18QH0600.180.601.880.950
LG18QH0650.180.651.880.950
LG18QH0700.180.701.880.950
LG18QH0750.180.751.880.950
Typical values, domain-refined grades
GradeThickness (mm)P1.7/50 typical (W/kg)J800 typical (T)
LG27QH1000.270.941.90
LG27QH0950.270.891.90
LG23QH0850.230.791.90
LG23QH0800.230.741.91
LG20QH0750.200.721.91

Recommended grades by transformer efficiency class (GB 20052)

Power transformers

Class 1LG23QH080

Class 2LG23QH090 · LG23QH085

Class 3LG27QH095

Oil-immersed distribution transformers

Class 1LG20QH070

Class 2LG23QH080 · LG20QH075

Class 3LG23QH085 · LG23QH080

Dimensional tolerances
Thickness (mm)Thickness tolerance (mm)Longitudinal deviation (mm)Transverse deviation (mm)
0.30−0.025 / +0.0100 / +0.0150 / +0.012
0.27−0.020 / +0.0100 / +0.0150 / +0.012
0.23−0.020 / +0.0100 / +0.0120 / +0.010
0.20−0.015 / +0.0100 / +0.0120 / +0.010
0.18−0.015 / +0.0100 / +0.0120 / +0.010

Width 900–1250 mm: tolerance 0 to +1.5 mm, flatness ≤ 1.5 %, camber ≤ 0.9 mm per 2 m.

Mechanical properties (typical)
Thickness (mm)Hardness HV1Yield (MPa)Tensile (MPa)Elongation (%)Bends
0.301983203491418
0.272023183451519
0.231983233591420
0.202033203481418
0.181983223491518

How to read a grade

LG23QH080
  1. LY Steel
  2. thickness × 100 (mm)
  3. grain-oriented
  4. G high permeability / H domain-refined
  5. P1.7/50 × 100 (W/kg)

Insulation coating

Inorganic coating · interlaminar resistance guaranteed ≥ 30 Ω·mm² per lamination · adhesion class B or better · uniform thickness for a high stacking factor · good punching and welding behaviour.

Grade cross-reference (equivalent loss class)
LysteelGB/T 2521.2Baosteel
LG23QH07523QH075B23R075
LG23QH08023QH080B23R080
LG23QG08523QG085B23P085
LG23QG09023QG090B23P090
LG27QH08527QH085B27R085
LG27QH09027QH090B27R090
LG27QG09527QG095B27P095
LG27QG10027QG100B27P100
LG30QG10530QG105B30P105

Equivalents are matched by thickness and guaranteed core-loss class; confirm against the relevant mill datasheet before substituting.

Material source

Our mill source: Hunan LY Steel Electromagnetic

Our grain-oriented and non-oriented grades come from Hunan LY Steel Electromagnetic Material Co., Ltd., the electrical steel company of LY Steel within Hunan Iron & Steel Group. The facts and images below are the mill’s own.

Our mill source: Hunan LY Steel Electromagnetic
1958

LY Steel founded; a core enterprise of Hunan Iron & Steel Group with over 12 million t of annual steel capacity.

1.2 Mt

Planned capacity of Lysteel Electromagnetic (est. Dec 2022): 0.4 Mt grain-oriented, 0.8 Mt non-oriented.

2026

Planned output: 400 kt non-oriented and 100 kt grain-oriented (2025: 300 kt and 46 kt).

0.68 W/kg

LG18QH075, first produced Dec 2025: core loss 0.68–0.72 W/kg at 1.7 T, induction 1.90–1.91 T.

142 mu

Silicon steel testing and R&D centre (RMB 190 M, opened June 2024); National Enterprise Technology Center and postdoctoral workstation.

17

Robots on the lines, 5 intelligent logistics systems and fully automatic testing of magnetic, mechanical and coating properties.

Grain-oriented milestones

  1. 2023-12GO project started
  2. 2025-06Full process line running; LG23QH090, LG27QH100 produced
  3. 2025-09LG23QH080, LG20QH075 produced
  4. 2025-10All wide widths in production
  5. 2025-12LG18QH075 produced
Lysteel GO grades in transformer projects
ProjectGrade
Yunnan Transformer · 220 kVLG23QH085
Julong · 220 kVLG23QH085
Yangzhou Huading · 220 kVLG23QH085 – LG23QH095
Shandong Taikai · 110 kVLG27QH095 – LG27QH100
Tianli Core · 110 kVLG23QH090 – LG27QH100
Liuzhou Tebian · 110 kVLG27QH100

Mill references published by Lysteel Electromagnetic.

LY Steel site
LY Steel site
Electrical steel line
Electrical steel line
Robot on the line
Robot on the line
Automated sample store
Automated sample store

Mill sources

  • Baosteel
  • China Baowu
  • Shougang
  • Hongwang
  • Lysteel
Guangzhou Huaxin Industrial Co., Ltd
1st Floor, Building 3, Tiande Electronic Industrial Park, No. 3 Linghuan West Road, Shiqi Town, Panyu District, Guangzhou, China

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Guangzhou Huaxin Industrial Co., Ltd

sales@huaxinelecsteel.com

WhatsApp: +86 158 7342 1434

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