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Welding Wire & Special Steel

China's leading manufacturer of high-performance welding consumables, heavy steel plates, flanges, grinding balls, and construction steel since 1993. Trusted in offshore, energy, and infrastructure projects worldwide.

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About Longteng Special Steel

Founded in 1993, Longteng Special Steel Group is a renowned private enterprise in China’s special steel industry. We are a fully integrated deep-processing manufacturer with capabilities in sintering, ironmaking, steelmaking, refining, continuous casting, rolling, and metal product processing.

With an annual output of 4.5 million tons of special steel products, we serve over 40 countries globally. Our leadership in niche markets is unmatched — we are China's largest producer of marine steel sections, prestressed concrete (PC) steel bars, and wear-resistant grinding balls, holding over 60% domestic market share in these segments.

1993
Founded
4.5M T/Y
Steel Output
40+
Countries Served
10
Business Segments
Longteng Steel Factory

Integrated Production Line

From raw material to finished product

Our Product Range

High-quality steel products engineered for durability, precision, and performance across industries including offshore, energy, construction, and mining.

MIG Welding Wire ER70S-6

MIG Welding Wire ER70S-6

Carbon-Steel Solid Welding Wire, ideal for sheet metal and structural welding with excellent arc stability.

  • Diameter: 0.8–1.6mm
  • Tensile Strength: ≥490 MPa
  • Copper Coated / Non-Copper Options
ER110S-G Welding Wire

ER110S-G Welding Wire

High impact strength at low temperatures, perfect for pipeline and offshore applications.

  • Low-Temperature Toughness
  • Suitable for -60°C environments
  • High Crack Resistance
Forged Weld Neck Flange

Forged Weld Neck Flange

ANSI B16.5 compliant, DN20–DN600, 150# to 600# pressure class, for high-pressure piping.

  • Material: Carbon/Alloy/SS
  • RF, RTJ, FF Face Types
  • NPS 1/2" to 24"
Grinding Ball For Mining

Forged Grinding Ball D40–D125

High wear resistance for ball mills in mining, cement, and mineral processing.

  • Diameter: 40–125mm
  • Hardness: HRC 58–65
  • Low Breakage Rate
Prestressed Concrete Steel Bar

Prestressed Concrete Steel Bar

High-strength threaded bars for bridges, high-rise buildings, and precast structures.

  • Grades: PSB785, PSB830, PSB1080
  • Diameter: 18–50mm
  • Corrosion-Resistant Coating
Angle Bar For Shipbuilding

Angle Bar For Shipbuilding

Marine-grade heavy section steel, 6m–20m lengths, for offshore and bridge construction.

  • Standards: CCS, ABS, LR, DNV
  • Thickness: 8–30mm
  • High Yield Strength
Submerged Arc Welding Wire

Submerged Arc Welding Wire

High deposition rate wire for heavy plate welding in shipbuilding and pressure vessels.

  • Compatible with HJ431 Flux
  • Diameter: 2.0–5.0mm
  • Smooth Feeding & Low Spatter
Plastic Mold Steel

Plastic Mold Steel

Pre-hardened tool steel with excellent polishability and dimensional stability.

  • Grades: P20, 718, NAK80
  • Hardness: 28–36 HRC
  • Uniform Structure
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Why Choose Longteng?

Integrated Production

From raw material to finished product — full control over quality and delivery.

Certified Quality

ISO 9001, ISO 14001, and product certifications from ABS, DNV, CCS, and more.

Global Reach

Products exported to over 40 countries, with strong presence in Asia, Europe, and Americas.

R&D Driven

Dedicated R&D team developing advanced materials for extreme environments.

1993
Established
4.5M
Tons Annual Output
40+
Countries Served
60%+
Market Share in Niche Segments

Applications & Project Cases

Xuelong Polar Expedition Ship

Xuelong Polar Ship

MIG welding wire used in critical structural joints of China's polar research vessel.

Oil & Gas Pipeline

Oil & Gas Pipelines

ER110S-G wire ensures crack resistance in low-temperature pipeline welding.

Wind Power Tower

Wind Power Towers

High-strength steel plates for wind turbine support structures.

Mining Ball Mill

Mining Ball Mills

Forged grinding balls increase mill efficiency and reduce downtime.

Latest News

January 8, 2025

Emei Longteng Indonesia Groundbreaking

The foundation stone of Emei Longteng Indonesia Co., Ltd. was successfully laid, marking our expansion in Southeast Asia.

December 13, 2024

Top 100 Enterprise Recognition

Longteng Special Steel ranked among China's top 100 industrial enterprises for innovation and sustainability.

December 1, 2025

China Industrial Carbon Peak Forum

Hosted at Longteng Hotel, the forum highlighted green steel production and carbon neutrality strategies.

Get in Touch

Contact our sales team for product inquiries, quotes, or technical support.

Contact Information

Contact Person: Kevin Yin

WhatsApp: +8613812837333

Email: [email protected]

Address: No.118 Hualian Road, Tongang Industrial Park, Meili Town, Changshu, Jiangsu, China

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