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Chemical composition standards for pipe tees

Aug. 13, 2025

1. Tee Material Classification and Chemical Composition

Pipe tees are key components in pipeline connections, and their chemical composition directly affects corrosion resistance, strength, and weldability. Common materials include:

1. Carbon Steel Tees: Taking ASTM A234 WPB as an example, carbon (C) ≤ 0.3%, manganese (Mn) 0.29-1.06%, phosphorus (P) ≤ 0.05%, and sulfur (S) ≤ 0.058% (data source: ASTM A234-2023). Low-carbon design ensures weldability, but rust-proofing treatment is required.

2. Stainless Steel Tees: For example, 304 (06Cr19Ni10) contains 18-20% chromium (Cr) and 8-10.5% nickel (Ni) (GB/T 12459-2017). High chromium and nickel content provides excellent acid and alkali resistance.

3. Alloy Steel Tees: Such as P91 (10Cr9Mo1VNb), containing 0.85-1.05% molybdenum (Mo) and 0.18-0.25% vanadium (V), exhibit excellent high-temperature strength (ASME SA335).

II. Comparison of International and Domestic Standards

Different countries have significant differences in chemical composition requirements for tees:

1. Chinese Standard Tees (GB/T): Such as GB/T 12459-2017, primarily for carbon steel and stainless steel, with stricter requirements for phosphorus and sulfur content than international standards.

2. American Standard Tees (ASTM): ASTM A403 (stainless steel tees) allows a wider nickel content range (8-11%) to accommodate different working conditions.

3. European Standard Tees (EN): Such as EN 10253-4, which has clear formula limits for the carbon equivalent (CE) of low-carbon steel tees (CE ≤ 0.43%) to ensure welding safety.

III. Effect of Composition on Properties

1. Carbon (C): Contents exceeding 0.3% reduce toughness but increase strength. A balance between these two is crucial.

2. Chromium (Cr): Contents of 10.5% or higher form a passive film, significantly improving corrosion resistance (see Materials Engineering Handbook).

3. Impurity Control: Excessive sulfur and phosphorus content can easily cause hot and cold brittleness. ASTM standards require a combined content of 0.1% or less.

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