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ASTM A199 Heat-exchanger Tubes
This specification covedrs several grades of minimum-wall-thickness, chromium-molybdenum and chromium-molybdenum-silicon, seamless, cold-drawn, intermediate alloy steel tubes for heat exchangers, condensers, and similar heat transfer apparatus.
Description
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1.Chemical composition
| steel grade | C | Mn | P (max) | S (max) | Si | Cr | Mo |
| T4 | 0.15max | 0.30-0.60 | 0.03 | 0.03 | 0.50-1.00 | 2.15-2.85 | 0.44-0.65 |
| T5 | 0.5-0.15 | 0.30-0.60 | 0.03 | 0.03 | 0.50 max | 4.00-6.00 | 0.45-0.65 |
| T7 | 0.15 max | 0.30-0.60 | 0.03 | 0.03 | 0.50-1.00 | 6.00-8.00 | 0.45-0.65 |
| T9 | 0.15max | 0.30-0.60 | 0.03 | 0.03 | 0.25-1.00 | 8.00-10.0 | 0.90-1.10 |
| T11 | 0.5-0.15 | 0.30-0.60 | 0.03 | 0.03 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
| T22 | 0.5-0.15 | 0.30-0.60 | 0.03 | 0.03 | 0.50 max | 1.90-2.60 | 0.87-1.13 |
2. Mechnical properties
| steel grade | Tensile strength (min) | Yield strength (Mpa) | Elongation (%) | Specific requirement |
| T4 | 415 | 170 | 30/22 | Hardness 85 HRB MAX |
| T5 | 415 | 170 | 30/22 | Hardness 85 HRB MAX |
| T7 | 415 | 170 | 30/22 | Hardness 85 HRB MAX |
| T9 | 415 | 170 | 30/22 | Hardness 85 HRB MAX |
| T11 | 415 | 170 | 30/22 | Hardness 85 HRB MAX |
| T22 | 415 | 170 | 30/22 | Hardness 85 HRB MAX |
3.Delivery Condition:
Heat treatment,Annealed, Normalized, Normalized and Tempered
4.Surface treatment:
Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting
Painting as requested.
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