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A 556 / 556M Cold Drawn Carbon Feedwater Heater Seamless Steel Pipe Black

Minimum Order Quantity : 5 Ton Price : negotiable
Packaging Details : Packing in wooden, hexagonal box or other seaworthy ways Delivery Time : 30 days
Payment Terms : T/T L/C D/P D/A WesternUnion MoneyGram Others Supply Ability : 60000 Ton/Year
Place of Origin: china Brand Name: Torich
Certification: ISO9001 Model Number: A 556 / A 556M

Detail Information

Color: Black OD: 50mm-120mm
ID: 5mm-12mm Material: Carbon Steel Tube
Technique: Cold Drawing Shape: Round
High Light:

seamless steel pipe


seamless carbon steel tube

Product Description


A 556/A 556M Cold-Drawn Carbon Feedwater Heater Seamless steel Tubes


1. Referenced Documents
1.1 ASTM Standards:
A 450/A 450M Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes E 30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron


2. Manufacture

2.1 Manufacture—Tubes shall be made by the seamless process and shall be cold drawn.

2.2 Heat Treatment:
2.2.1 Cold-drawn tubes shall be heat treated after the final cold-draw pass at a temperature of 1200°[640°C] or higher to ensure ductility satisfactory for rolling into tube sheets and to meet mechanical properties as specified.
2.2.2 If stress-relief anneal of the U-bends is specified, the anneal shall consist of heating the bent portion within a range of 1100 to 1200°F [585 to 640°C].

3. Chemical Composition
3.1 The steel shall conform to one of the requirements as to chemical composition as prescribed in Table 1. 3.2 When a grade is ordered under this specification, supplying an alloy grade that specifically requires the addition of any element other than those listed for the ordered grade in


TABLE 1 Chemical Requirements
Element  Composition, %
  Grade A2 Grade B2 Grade c2
Carbon, max 0.18 0.27 0.3
Manganese 0.27-0.63 0.29-0.93 0.29-1.06
Phosphorus 0.035 0.035 0.035
Sulfur, max 0.035 0.035 0.035
Silicon, min ... 0.10 0.10


4. Permissible Variations in Dimensions (Fig. 1)
4.1 Permissible variations from the specified outside diametershall not exceed 0.004 in. [0.10 mm] for tubing under1.0-in. [25.4-mm] outside diameter nor 0.006 in. [0.15 mm]for tubing 1.0 in. [25.4 mm] to 1.25 in. [31.7 mm] inclusive.These tolerances do not apply to the bent portion of theU-tubes. At the bent portion of a U-tube for R = 2 D orgreater neither the major nor minor diameter of tube shalldeviate from nominal by more than 10 %. If 1 ⁄ D is specified,tolerances could be greater.
4.2 Permissible variations from the specified minimum wallthickness shall not exceed +20 % or −0. The wall thickness of

TABLE 2 Tensile Requirements
  Grade A2 Grade B2 Grade C2
Tensile strength, min, ksi [MPa] 47[320] 60[410] 70[480]
Yield strength, min, ksi [MPa] 26[180] 37[260] 40[280]
Elongation in 2 in. or 50 mm,
min, % (longitudinal)
35 30 30



TABLE 3 Hardness Requirements
Grade A2 HR B 72
Grade B2 HR B 79
Grade C2 HR B 89


the tube in U-bent section shall be not less than valuedetermined by:
tf T 2R / 2R D (1)
t = wall thickness after bending, in. [mm],
T = specified minimum tube wall thickness, in. [mm],
R = centerline bend radius, in. [mm], and
D = nominal outside tube diameter, in. [mm].


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