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表1 化學成分及頭部标記
頭部标記 | 螺栓類型 | 成分% | |||
碳 | 錳 | 磷 | 硫 | ||
T-0 | 0 | 0.55 max |
| 0.048 max | 0.058 max |
T-1 | 1 | 0.28~0.55 | 0.60 min | 0.048 max | 0.058 max |
T-3 | 3 |
|
|
| 見表2 |
表2 3型重型六角結構螺栓的化學成分要求
化學元素 | 成份 % | ||||||
等級 | |||||||
A | B | C | D | E | F | ||
碳 C | 熔煉分析 | 0.33~0.40 | 0.38~0.48 | 0.15~0.25 | 0.15~0.25 | 0.20~0.25 | 0.20~0.25 |
產品分析 | 0.31~0.42 | 0.36~0.50 | 0.14~0.26 | 0.14~0.26 | 0.18~0.27 | 0.19~0.26 | |
錳 Mn | 熔煉分析 | 0.90~1.20 | 0.70~0.90 | 0.80~1.35 | 0.40~1.20 | 0.60~1.00 | 0.90~1.20 |
產品分析 | 0.86~1.24 | 0.67~0.93 | 0.76~1.39 | 0.36~1.24 | 0.56~1.04 | 0.86~1.24 | |
磷 P | 熔煉分析 | 0.035 max | 0.06~0.125 | 0.035 max | 0.035 max | 0.035 max | 0.035 max |
產品分析 | 0.040 max | 0.06~1.25 | 0.040 max | 0.040 max | 0.040 max | 0.040 max | |
硫 S | 熔煉分析 | 0.040 max | 0.040 max | 0.040 max | 0.040 max | 0.040 max | 0.040 max |
產品分析 | 0.045 max | 0.045 max | 0.045 max | 0.045 max | 0.045 max | 0.045 max | |
矽 Si | 熔煉分析 | 0.15~0.35 | 0.30~0.50 | 0.15~0.35 | 0.25~0.50 | 0.15~0.35 | 0.15~0.35 |
產品分析 | 0.13~0.37 | 0.25~0.55 | 0.13~0.37 | 0.20~0.55 | 0.13~0.37 | 0.13~0.37 | |
銅 Cu | 熔煉分析 | 0.25~0.45 | 0.20~0.40 | 0.20~0.50 | 0.30~0.50 | 0.30~0.60 | 0.20~0.40 |
產品分析 | 0.22~0.48 | 0.17~0.43 | 0.17~0.53 | 0.27~0.53 | 0.27~0.63 | 0.17~0.43 | |
鎳 Ni | 熔煉分析 | 0.25~0.45 | 0.50~0.80 | 0.25~0.50 | 0.50~0.80 | 0.30~0.60 | 0.20~0.40 |
產品分析 | 0.22~0.48 | 0.47~0.83 | 0.22~0.53 | 0.47~0.83 | 0.27~0.63 | 0.17~0.43 | |
鉻 Cr | 熔煉分析 | 0.45~0.65 | 0.50~0.75 | 0.30~0.50 | 0.50~1.00 | 0.60~0.90 | 0.45~0.65 |
產品分析 | 0.42~0.68 | 0.47~0.83 | 0.27~0.53 | 0.45~1.05 | 0.55~0.95 | 0.42~0.68 | |
釩 V | 熔煉分析 | ① | ① | 0.020 min | ① | ① | ① |
產品分析 | ① | ① | 0.010 min | ① | ① | ① | |
钼 Mo | 熔煉分析 | ① | 0.06 max | ① | 0.10 max | ① | ① |
產品分析 | ① | 0.07 max | ① | 0.11 max | ① | ① | |
钛 Ti | 熔煉分析 | ① | ① | ① | 0.05 max | ① | ① |
產品分析 | ① | ① | ① | 0.06 max | ① | ① | |
①這些元素沒有指定或要求。 | |||||||
表3 抗拉強度A
公稱直徑（in） | 最小拉力載荷（lbf） | |
Type 0 B | Type 1和3 C | |
1/2 | 10500 | 17050 |
5/8 | 16700 | 27100 |
3/4 | 24700 | 40100 |
7/8 | 34200 | 55450 |
1 | 44850 | 72700 |
A. 螺紋應力截面積計算公式：AS = 0.7854 [ D -（0.9743/N）]2，D=公稱直徑，N=每英寸螺紋牙數。 B. Based on 74 000 psi unit tensile strength. C. Based on 120 000 psi unit tensile strength. | ||
螺栓太短，無法進行全尺寸測試或由于其他原因未進行拉力測試，應符合以下硬度：
Type 0 —— Rockwell B：80~100
Type 1 和3 —— Rockwell C：25~34
在原始詢價和訂單中有規定的情況下，螺栓應按照原件中11.2進行抗剪強度試驗，并應滿足表4的要求。（無螺紋螺栓體長度小于螺栓公稱直徑兩倍的螺栓，買賣雙方就試驗方法和抗剪強度值達成一緻後，才能進行抗剪強度試驗。）
表4 抗剪強度
公稱直徑（in） | 最小負載（lbf） | |||
Type 0 | Type 1 和3 | |||
Single Shear Strength Through Threads A | Single Shear Strength Through BodyB | Single Shear Strength Through Threads C | Single Shear Strength Through BodyD | |
1/2 | 6950 | 9000 | 9350 | 14600 |
5/8 | 11150 | 14100 | 15050 | 22850 |
3/4 | 16650 | 20250 | 22450 | 32850 |
7/8 | 23150 | 27600 | 31150 | 44750 |
1 | 30400 | 36050 | 41000 | 58450 |
A. Based on 55 200 psi unit shear strength across the area at root of threads. B. Based on 45 880 psi unit shear strength across the nominal area. C. Based on 74 400 psi unit shear strength across the area at root of threads. D. Based on 74 400 psi unit shear strength across the nominal area. | ||||
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