ASTM A556 Cold Drawn Seamless Heater Tubes

ASTM A556 standard specifies the requirements for seamless carbon steel pipes for feedwater heaters. ASTM A556 is available in different grades such as A2, B2, and C2.
ASTM A556 alloy pipes are mainly used in boilers and petrochemical industries that need to withstand high temperatures, high pressures, and corrosive environments. They are an important part of heat exchangers.
GNEE is a professional manufacturer of A556 heat exchanger tubes, and also provides ASTM A556 C2 grade seamless U-bend steel pipes.

Chemical Components (%) of ASTM A556 Cold Drawn Tubes

Grade	C %	Si %	Mn %	P %	S %
A2	0.18	...	0.27–0.63	0.035	0.035
B2	0.27 max	0.10 min	0.29-0.93	0.030 max	0.030 max
C2	0.30 max	0.10 min	0.29-1.06	0.030 max	0.030 max

Mechanical Properties of ASTM A556 Seamless Heater Tubes

Grade	Tensile strength, min, ksi [MPa]	Yield strength, min, ksi [MPa]	Elongation in 2 in. or 50 mm, min, % (longitudinal)	Hardness Requirements
A2	47 [320]	26 [180]	35	HR B 72
B2	60 [410]	37 [260]	30	HR B 79
C2	70 [480]	40 [280]	30	HR B 89

ASTM A556 / A556M Standard Specification for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tube.
Grades: ASTM A556 Grade A2, Grade B2, Grade C2
Dimensions:
Outer Diameter: 12-40 mm
Wall Thickness: 1-4 mm
Length: Maximum Length 27 m