Torich ASTM A556 Gr A2 B2 C2 Seamless Boiler Tubes
Torich ASTM A556 Seamless Cold Drawn Seamless Boiler Pipe
This standard is issued under the fixed designation A556/A556M；the number immediately following the designation indicate the year of original adoption or,in the case of revision,the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon indicates an editorial change since the last revision or reapproval.
Reference documents:
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
1. Scope: 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 :
| 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 |
Picture:
QUALITY CONTROL
1~ Incoming Raw Material Inspection
2~ Raw Material Segregation to avoid steel grade mix-up
3~ Heating and Hammering End for Cold Drawing
4~ Cold Drawing and Cold Rolling, on line inspection
5~ Heat Treatment, +A, +SRA, +LC, +N, Q+T
6~ Straightening-Cutting to specified length-Finished Measuring Inspection
7~ Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8~ Packing and Stocking.
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