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

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)
where:
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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Categories	Seamless Steel Tube
Brand Name:	Torich
Model Number:	A 556 / A 556M
Certification:	ISO9001
Place of Origin:	china
MOQ:	5 Ton
Price:	negotiable
Supply Ability:	60000 Ton/Year
Delivery Time:	30 days
Packaging Details:	Packing in wooden, hexagonal box or other seaworthy ways
Color:	Black
OD:	50mm-120mm
ID:	5mm-12mm
Material:	Carbon steel tube
Technique:	Cold Drawing
Shape:	Round
Payment Terms:	T/T L/C D/P D/A WesternUnion MoneyGram Others