1.交货条件的组合
表B.1-交货时热处理条件、产品形式和适用要求的组合
原文表头对照：Heat-treatment condition at delivery＝交货热处理状态；Symbol＝符号；Wire rod＝盘条；Bar＝棒材；Wire＝钢丝。原标准表格、符号及适用条件保留如下。
| Heat-treatment condition at delivery | Symbol | Products form a | Applicable requirements in cases where the steel concerned has been ordered with reference to the steel names indicated in | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Wire rod | Bar | Wire | T a b les B. 2,B.3,B.4 or B.5 | Ta bles B. 2,B.3,B.4,B.5,B.6 or B,7 | Optional | |||||
| As hot-rolled or peeled | +AR or +PE | X | X | X | Chemical composition as specified in Table B.2 | Mechanical properties as specified in Ta b le s B.3 ,B.4 and B.5 | Chemical compositior as specified in Table B.2 | Mechanical properties as specified in Tables B,3, B.4 and B.5 | Values for hardenability according to Ta ble s B.6 and B.7 | Supplementa- ry or special requirements as specified in Annex Eh |
| Cold drawn | +AR+C | - | X | X | ||||||
| Cold drawn + spheroidized | +AR+C+AC | - | X | X | ||||||
| Cold drawn + spheroidized+skin passed | +AR+C+AC +LC | - | X | X | ||||||
| Spheroidized or spheroidized+peeled | +AC or +AC +PE | X | X | X | ||||||
| Spheroidized+cold drawn | +AC+C | X | X | |||||||
| Treated to ferrite- pearlite structure and hardness range | +FP | - | X | - | ||||||
| Others | Other delivery conditions may be agreed at the time of ordering | |||||||||
| a X=applicable,-=not applicable. b If agreed at the time of the enquiry and order. | ||||||||||
2.化学组成
化学成分来源与适用范围
以下为所列标准版本的参考成分，非炉批实测；订单适用标准、原料与成品要求须分别确认。
来源: ISO 4954:2018 · Table B.2 · 22MnB4 · p.29
| 元素 | 质量分数 / % |
|---|---|
| C | 0.2–0.24 |
| Si | ≤0.3 |
| Mn | 0.9–1.2 |
| P | ≤0.025 |
| S | ≤0.025 |
| B | 0.0008–0.005 |
| Cu | ≤0.25 |
Single values are maxima unless indicated otherwise; unlisted elements and blank cells are not assumed zero. Alternative limits, optional additions and analysis tolerances require the relevant table notes and order agreement. This reference table does not replace the complete standard.
3.力学性能
表B.4-硼合金钢牌号的力学性能
| Steel name | Diameter | Delivery condition | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| +AR | +AC or +AC+PE | +AR+C | +AR+C+AC | +AR+C+AC+LC | +AC+C | |||||||||
| above mm | up to mm | Rm max. MPa | Za min % | Rm max. MPa | Z min. % | Rm max. MPa | Z min % | Rm max. MPa | Z min. % | Rm max. MPa | Z min. % | Rm max. MPa | Z min. % | |
| 22MnB4 | 2 | 5 | — | — | 520 | 64 | 560 | 62 | — | |||||
| 5 | 10 | 600 | 55 | 520 | 62 | 720 | 53 | 500 | 64 | 540 | 62 | 630 | 59 | |
| 10 | 40 | 600 | 55 | 520 | 62 | 710 | 53 | 500 | 64 | 540 | 62 | 620 | 59 | |
| a The values are given only for information. | ||||||||||||||
4.淬透性要求
表B.6-标准淬透性钢种的硬度限值 (H级)
| Steel name | Symbol | Austenitizing temperature ℃±5℃ | Limits of range | Hardness HRC at a distance from quenched end of test piece(in mm)of | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1,5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | ||||
| 22MnB4 | +H | 880 | max. | 49 | 48 | 47 | 45 | 42 | 39 | 35 | 32 | 24 | 20 | — | ||
| min. | 43 | 41 | 40 | 32 | 23 | — | — | — | — | |||||||