API5L/A106B Seamless Steel Tubes
A106B steel’s chemical composition is similar to that of A53 Grade B and API 5L B. Its carbon content maxes out at 0.3% and its nickel at 0.4%. Its manganese minimum must fall between 0.29% και 1.06%.
Grade B maintains a higher carbon content than grade A but less than grade C. For each reduction of 0.01% of the maximum carbon amoun, manganese may increase 0.06% above the specified value up to a maximum of 1.35%.
The differences in chemistry between A53 and A106 seem minor, but they are important. A53 steel may include silicon, but A106 steel must include at least 0.10% silicon in the alloy. Silicon is an important component in heat resistance ability.
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A106 steel must be produced with killed steel — a totally deoxidized alloy that features a high degree of chemical homogeneity. In killed steel, no reaction occurs between the carbon and the oxygen during solidification. Consequently, the product is more chemically uniform.
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API5L/A106B Seamless Steel Tubes
Standard: ASTM A106B/API 5L
Seamless carbon steel tubes for high-temperature service
● Application: for high temperature service.
● Size range: O.D.: 15-120mm W.T.: 1-15mm L.: 15000mm max.
Table 1: steel grade and chemical composition:
| Grade | C (μέγ.) | Μν | P (μέγ.) | S (μέγ.) | Σι (Λεπτά) | Cr (μέγ.) | Cu (μέγ.) | Mo (μέγ.) | N (μέγ.) | V (μέγ.) |
| A | 0.25 | 0.27-0.93 | 0.035 | 0.035 | 0.10 | 0.40 | 0.40 | 0.15 | 0.40 | 0.08 |
| B | 0.30 | 0.29-1.06 | 0.035 | 0.035 | 0.10 | 0.40 | 0.40 | 0.15 | 0.40 | 0.08 |
| C | 0.35 | 0.29-1.06 | 0.035 | 0.035 | 0.10 | 0.40 | 0.40 | 0.15 | 0.40 | 0.08 |
Table 2: Mechanical property:
| Grade | Tensile Strength Rm (Mpa) | Yield Point (Mpa) | Elongation A% | Delivery Condition |
| A | ≥330 | ≥205 | 20 | Annealed |
| B | ≥415 | ≥240 | 20 | Annealed |
| C | ≥485 | ≥275 | 20 | Annealed |
Table 3: Dimension Tolerances：
| Pipe Type | Pipe Sizes | Tolerances | |
| Cold Drawn | OD | ≤48.3mm | ±0.40mm |
| ≥60.3mm | ±1%mm | ||
| WT | ±12.5% | ||
A106 steel’s chemical composition is similar to that of A53 Grade B and API 5L B. Its carbon content maxes out at 0.3% and its nickel at 0.4%. Its manganese minimum must fall between 0.29% και 1.06%.
Grade B maintains a higher carbon content than grade A but less than grade C. For each reduction of 0.01% of the maximum carbon amoun, manganese may increase 0.06% above the specified value up to a maximum of 1.35%.
The differences in chemistry between A53 and A106 seem minor, but they are important. A53 steel may include silicon, but A106 steel must include at least 0.10% silicon in the alloy. Silicon is an important component in heat resistance ability.
A106 steel must be produced with killed steel — a totally deoxidized alloy that features a high degree of chemical homogeneity. In killed steel, no reaction occurs between the carbon and the oxygen during solidification. Consequently, the product is more chemically uniform.
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