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Hebei Haihao Group Huadian High Pressure Pipe Fittings Co., Ltd.
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Hebei Haihao Group Huadian High Pressure Pipe Fittings Co., Ltd.Hebei Haihao Group Huadian High Pressure Pipe Fittings Co., Ltd.Pressure Pipe Fittings · Flanges · Factory Direct

Since 1982. Pressure piping component manufacturer covering elbows, flanges, tees, reducers and project supply.

ISO 9001 quality system · ABS Type Approval · safety-registered manufacturer

Products

  • Elbow
  • Tee
  • Reducer
  • Flange
  • Pipe Bend

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Contact

  • Donglin, Mengcun County, Cangzhou City, Hebei Province, China
  • +86 132 9342 5333
  • haihaojituan@163.com
  • www.haihaohuadian.com

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Insights

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Technical articles, standards comparisons, project case studies and buyer guides on pressure piping components, flanges and forged fittings.

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31 articles· Technical

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Technical

ASTM A350 LF3 Chinese Equivalent: Why Buyers Should Not Match by Grade Name Alone

A buyer guide for A350 LF3 low-temperature forgings and Chinese-equivalent questions: compare chemistry, mechanical properties, impact temperature and project approval, not just grade names.

Jun 1, 20266 min readHebei Haihao Group
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Technical

9% Nickel Steel Pipe and Fittings for Cryogenic LNG Service

How 9% nickel steel grades to ASTM A553 Type I and matching pipe to A333 Gr 8 enable LNG and cryogenic piping down to -196 degC, with buyer guidance.

May 30, 20268 min readHebei Haihao Group
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Technical

Hastelloy C-276 vs C-22 Pipe Fittings: Service and Welding

Compare Hastelloy C-276 and C-22 pipe fittings on chromium content, pitting resistance, wet chlorine performance and weld metallurgy for procurement engineers.

May 28, 20267 min readHebei Haihao Group
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Technical

GB Pressure Piping RT Percentage: How to Specify NDT Without Guessing

A practical buyer guide for GB pressure piping RT percentage questions: why there is no universal number, what documents to request, and how to write NDT requirements in an RFQ.

May 27, 20267 min readHebei Haihao Group
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Technical

Duplex 2205 vs Super Duplex 2507 Fittings for Sour and Seawater

How to choose between Duplex 2205 and Super Duplex 2507 buttweld fittings using PREN, chloride pitting limits and NACE MR0175 sour service guidance.

May 26, 20268 min readHebei Haihao Group
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Technical

Inconel 625 vs Inconel 825 Buttweld Fittings: A Buyer Guide

Side-by-side comparison of Inconel 625 and Incoloy 825 buttweld fittings: chemistry, temperature envelope, corrosion resistance and selection rules.

May 24, 20268 min readHebei Haihao Group
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Technical

Normalizing vs Quench and Temper for Buttweld Fittings

When to specify normalizing, normalizing and tempering, or quench and temper for ASTM A234 and A420 buttweld pipe fittings on EPC projects.

May 22, 20267 min readHebei Haihao Group
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Technical

Carbon Equivalent CEV Calculation Explained for Pipe Buyers

Understand the IIW carbon equivalent CEV formula, why it controls weldability, and how to use it when buying carbon and low-alloy pipe and fittings.

May 20, 20266 min readHebei Haihao Group
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Technical

ASTM A350 LF2 vs LF3 vs LF6 Low Temperature Flange Guide

Compare ASTM A350 LF2, LF3 and LF6 forged flanges by impact test temperature, chemistry and best-fit service for cold and cryogenic piping projects.

May 18, 20268 min readHebei Haihao Group
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