Limestone Quarry Plant

One of the Top 500 enterprises in China foreign trade

QCCO was approved as a member of “China Association for Contracting Projects Abroad “and granted a membership certificate on Sep 28,2005; “Credibility Rating AAA certificate in Foreign Trade” was granted to QCCO by China Shippers’ Association


ASTM A333 A334 alloy pipe

ASTM A-333 and A-334, Grade 1 to 11 (low temperature service)

Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service

Seamless alloy pipe A335 P2 P5 P9 P11 P22 P91 P92


Impact requirements: the notched-bar impact properties of each set of three impact specimens, when tested at temperature specified shall be not less than the values prescribed.


  • Execution: Seamless, Welded (ERW, LSAW, DSAW, etc)
  • Sections: Round, Square, Rectangular
  • Coatings: Pipes can be delivered with different internal / external coatings in compliance with the most rigorous international standards and Customers' specifications.
  • Grades:
    • ASTM / ASME SA-335 Gr. P1, P5, P9, P11, P22, P91
    • ASTM / ASME SA-213 Gr. T1, T5, T9, T11, T22, T91
    • A519 4130, 4140/42
    • Rolled & Welded ASTM A-691
    • Not mentioned standards, grades and specifications available upon request

Dimensional Range

  • Size range: ¼” nominal through 24'' OD seamless and up to 48” OD welded
  • Wall thickness up to 4'' & heavier upon request
  • In lenghts of Standard length (SRL), Double length (DRL) & In Cut length also

Chemical Composition (%)

Mechanical Properties


  Grade 1 Grade 6 Grade 10
Carbon, max 0.30 0.30 0.20
Manganese 0.40-1.06 0.29-1.06 1.15-1.50
Phosphorus, Sulfur, max 0.025 0.025 0.035/0.015
Silicon, min 0.10 0.10-0.35
Nickel, max 0.25
Chrome, Copper, max 0.15
Columbium, Molybdenum, max 0.05
Aluminum, max 0.06
Vanadium, max 0.12


Grade 1
Grade 6
Grade 10
Tensile strength, min, (MPa)
Yield strength, min, (MPa)
Elongation, min, (%), L/T


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