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Astm A556 Grade A2 Grade B2 Grade C2 U-Tubes For Use In Tubular Feed Water Heaters
This specification covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes including bending into the form of U-tubes,if specified,for use in tubular feed water heaters.
Size : from 5/8 to 1 1/4-in 15.9-31.8mm
Outerside diameter,inclusive,with minimum wall thickness equal to or greater than 0.045inch (1.1mm)
Order Information:
OD: 5/8’’- 1 1/4” (15.9-31.8mm)
WT: ≥ 0.045’’ 1.1mm
OD Tolerance : 0,+20%
Chemical Requirement :
Element | Composition ,% | ||
| Grade A2 | Grade B2 | Grade C2 | |
| Carbon, max | 0.18 | 0.27 | 0.30 |
| Manganese | 0.27-0.63 | 0.29-0.93 | 0.29-1.06 |
| Phosphorus, max | 0.035 | 0.035 | 0.035 |
| Sulfur, max | 0.035 | 0.035 | 0.035 |
| Silicon , min | ... | 0.10 | 0.10 |
Hardness Requirement
| Grade A2 | HR B 72 |
| Grade B2 | HR B 79 |
| Grade C2 | HR B 89 |
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 50min, min,%(longitudinal) | 35 |
30 | 30 |
Reference documents:
ASTM standard.
A450/A450M Specification for General Requirement for Carbon and Low Alloy Steel Tubes
E30 Test Methods for Chemical Analysis of Steel,Cast Iron,Open-Hearth Iron and Wrought Iron
