5182铝合金是什么
5182是一种铝镁合金，通过镁的固溶强化和冷加工强化。它不能通过沉淀硬化处理——不存在固溶处理和时效强化路径，因此所有高于退火态的性能均来自应变强化，以H状态表示。.
由此产生两个后果，二者都体现在该合金的采购方式中：
- 状态就是规格。. 订购“5182”而不注明状态是没有意义的。5182-O（屈服强度约145 MPa，延伸率21%）与5182-H19（屈服强度约395 MPa，延伸率4%）之间的差距，比许多不同合金之间的差距还要大。.
- 焊接会软化热影响区。. 冷加工硬化在焊接热循环作用下被局部退火消除，且没有热处理手段可以恢复。焊接接头强度低于H态母材，接头设计必须以此为前提。.
扁平轧制产品的适用规范为 ASTM B209 （薄板和板材），, EN 485-2 （力学性能）和 EN 573-3 （化学成分）——欧洲标准，, GB/T 3880 ——中国标准，以及 JIS H4000 ——日本标准。汽车板材通常按 GMW15192 或等效的整车厂材料标准进行规定，而非仅依据B209。等效牌号为 UNS A95182, EN AW-5182和 ISO AlMg5 在部分参考资料中。.
5182的化学成分
| 要素 | 重量 % | 在合金中的作用 |
|---|---|---|
| 镁（Mg） | 4.0 – 5.0 | 主要强化元素；决定耐腐蚀性能 |
| 锰 (Mn) | 0.20 – 0.50 | 晶粒组织控制，韧性 |
| 铁（Fe） | 0.35 最大值 | 杂质——受控以保护成形性能 |
| 硅 (Si) | 0.20（最大值） | 杂质——保持低含量以限制成形开裂 |
| 铜 (Cu) | 0.15 最大值 | 杂质——保持低含量以保护耐腐蚀性能 |
| 锌 (Zn) | 最大 0.25 | 杂质 |
| 铬 (Cr) | 最大 0.10 | 微量晶粒组织控制 |
| 钛 (Ti) | 最大 0.10 | 铸造过程中的晶粒细化剂 |
| 其他元素（每种 / 总计） | 0.05 / 0.15（最大值） | — |
| 铝 (Al) | 余量（93.2 – 95.8） | 贱金属 |
镁的含量范围是需要记住的关键数字。在4.0–5.0%范围内，5182的镁含量高于5083（4.0–4.9%），远高于5052（2.2–2.8%）。这既是其强度和耐腐蚀性能的来源——也正是将其牢牢置于本指南后文所讨论的温度限制之内的原因。.
物理特性
| 财产 | 价值 |
|---|---|
| 密度 | 2.65 – 2.66 g/cm³ |
| 熔化范围 | 577 – 638 °C（1,070 – 1,180 °F） |
| 导热性 | 25 °C时约126 W/m·K |
| 导电性 | 20 °C时约28 – 32% IACS |
| 热膨胀系数 | 23.9 × 10⁻⁶ /°C（20–100 °C） |
| 比热容 | ~900 J/kg-K |
| 弹性模量（拉伸） | 约70 GPa（10,100 ksi） |
| 泊松比 | 0.33 |
其中两项经常被错误引用。熔化范围为 577–638 °C, ，而非常从5052数据表中照搬的607–649 °C——5xxx系合金的物理性能在不同牌号之间经常被混淆，而5182和5052在大多数性能表中相邻。此外，约126 W/m·K的热导率远低于5052的约138 W/m·K，如果零件需要散热而非仅仅保持形状，这一点至关重要。.
不同回火状态下的力学性能
以下数值为铝业协会参考数据中的典型值。它们具有代表性，但并非保证值——设计和验收应使用适用标准中对指定状态和厚度规定的最小值，并结合工厂检测报告上的数值。.
| 脾气 | 抗拉强度 (MPa) | 屈服强度 (MPa) | 伸长率 (%) | 典型用途 |
|---|---|---|---|---|
| O | ~276 | ~145 | ~21 | 深冲、复杂成形、汽车内板 |
| H111 | ~260 | ~125 | ~18 | 罐车板材、燃料箱、成形焊接件 |
| H32 | 290 – 315 | 210 – 230 | 10 – 12 | 汽车车身板、扁平结构板材 |
| H34 | ~331 | ~255 | ~11 | 需要更高强度的车身板和结构板材 |
| H38 | ~372 | ~324 | ~6 | 高强度扁平零件 |
| H19 / H39 | ~420 | ~395 | ~4 | 罐盖、拉环、制罐料 |
| H116 / H321 | 面向船舶应用的供应 | 非主承力船舶结构——按标准确认最小值 |
从O态到H19态的屈服强度跨度约为145至395 MPa。这不是一个小的订货细节；这是能拉深成车门内板的材料与能冲压成罐拉环的材料之间的区别。.
哪种状态适用于哪种用途
- O 为退火态，完全软化，具有深冲、旋压成型和复杂冲压所需的延伸率。汽车内板和成型罐端从这里开始。.
- H111 为轻度应变硬化——强度高于O态，仍可成型，是焊接罐车车身和燃料箱的常用选择。.
- H32 和 H34 为汽车车身板状态，经应变硬化并稳定化处理。它们提供了外板所需的强度和抗凹痕性能，同时保持足够的成型性以进行冲压。H34偏重强度，H32偏重成型性。.
- H19和H39 为包装用状态。通过重度冷轧获得极高强度，延伸率刻意保持较低——罐端和拉环的生产是冲孔和刻痕操作，而非深冲，且材料需要在薄规格下保持形状。如果您为制罐料采购5182，这就是所需的状态，而重要的性能既在于绝对值，也在于整卷的一致性。.
成型性与深冲
成型性是5182在汽车板材中占据一席之地的关键，而其表现远比简单的“优秀”或“良好”评级更为微妙。.
在退火和轻度加工状态（O、H111）下，5182具有良好的深冲性能——约18–21%的延伸率可支持深冲、复杂冲压和旋压成型。与5052相比，5182以略微牺牲极限深冲性换取明显更高的强度：5052通常在最深冲中表现更好，而5182一旦成型后能更好地保持形状和抵抗凹痕。与5083相比，5182在两者中成型性明显更优，这也是5083主导船体板材而5182主导车身板的主要原因之一。.
对于汽车外板，实际决定选材的数据是 塑性应变比（r值） 以及 应变硬化指数（n值）, ，而不仅仅是延伸率。r值控制拉伸过程中的抗减薄能力；n值控制局部颈缩前应变的分布方式。为外露汽车板供应5182的工厂需对这些指标进行认证，GMW15192等主机厂标准也对其作出规定。如果您为可见车身板采购，请在拉伸和屈服性能之外同时要求提供r值和n值——满足拉伸范围的5182仍可能在冲压中失败。.
两点实际注意事项。较高的镁含量意味着5182比5052加工硬化更快，因此需要更大的力、在较硬状态下需要更大的弯曲半径，并且需要更多关注回弹。在5052可一次完成的多次拉深中，5182可能需要中间退火。.
耐腐蚀性与65 °C极限
高镁含量赋予5182良好的耐大气、海水和多种食品介质腐蚀性能，这也是该合金在船用配件和配备合格漆系的食品接触包装中以未涂层状态使用的原因。在氯化物环境中，其耐蚀性明显优于5052和5754。.
限制因素在于热暴露，而5182受此约束比大多数5xxx系合金更为严格。.
当镁含量高于约3%时，持续暴露于温热环境会使镁以β相（Al₃Mg₂）沿晶界析出。该网络相对于周围基体为阳极，使合金易于发生晶间腐蚀、剥落腐蚀和应力腐蚀开裂。通常的工程极限为 65 °C（150 °F） ，适用于腐蚀环境中的连续使用。5182的镁含量为4.0–5.0%，处于商业合金范围的顶端，因此该限制的余量比5052更小。.
实际应用中：
- 避免5182在高于65 °C的环境中持续使用——如高温工艺管线、未隔热的排气区域以及长期处于温热状态的设备。.
- 在无法避免温热使用环境时，应考虑5052或5454，而非试图通过工程手段规避敏化。析出是不可逆的。.
- 对于船舶用途，可供应H116或H321状态，但需根据适用标准和工厂质保书确认状态及其保证最低值。.
电偶腐蚀是第二个注意事项，与任何5xxx系合金的规则相同：5182相对于钢、不锈钢和铜合金为阳极。在存在电解质的异种金属组件中，应对接头进行绝缘或增加牺牲阳极保护。.
5182的焊接
5182可通过GMAW（MIG）和GTAW（TIG）焊接，在罐车车身、燃料箱和船用配件中经常进行焊接。焊丝通常为5xxx系焊丝—— ER5356 用于一般作业并与镁含量匹配，同时 ER5183 可作为需要更高焊态强度或更好海洋耐蚀性能时的选项。.
焊接无法保持冷加工性能。热影响区被焊接热循环退火；应变硬化在局部被消除且无法恢复，因为该合金不可热处理强化。焊接后的H32或H34接头强度低于母材，而软化带——而非焊缝金属——通常是决定接头设计的因素。.
设计规则直接由此得出： 焊接5182接头的尺寸应按退火态热影响区性能设计，而非按母材状态值。. 按255 MPa屈服强度计算的H34组件，其承载截面将通过一个屈服强度接近145 MPa的区域。AWS D1.2发布了焊接铝结构的许用应力，是应依据的参考标准。.
机加工与表面处理
机械加工 的机加工性一般而非良好。5182加工硬化快，在较软状态下产生带状切屑；较硬状态下切削更干净，断屑更好。通常建议使用锋利的硬质合金刀具、正前角几何形状和充足的切削液。它不是易切削合金，与6061或2011对比报价的加工车间会注意到刀具寿命和加工周期的差异。.
表面处理 在包装和车身板应用中是优势——该合金可轧制出清洁、均匀的表面，能很好地接受涂层、漆和印刷，这也是它占据罐端市场的原因之一。它可以进行阳极氧化以提供保护，但与其他高镁合金一样，它不是装饰性阳极氧化合金；其表面光洁度不如5005或6063明亮均匀，批次间的颜色一致性也更难保持。指定阳极氧化时应以防护为目的，而非外观。.
5182的应用领域
罐端和拉环 是全球主要用途，以H19状态生产。在规格指定时这一区分很重要： 罐体通常采用3xxx系合金如3004, ，而罐端、易开盖和拉环为5182。如果询价仅说“饮料罐”而未说明具体部件，合金可能是两者之一——报价前请先确认。.
汽车车身板 是第二大市场——引擎盖、车门、翼子板、内板和结构加强件，根据零件成型需求采用O至H34状态。驱动力是减重并具有可接受的抗凹痕性能，这也是r值和n值出现在这些规格中的原因。.
罐车车身和燃料箱 使用H111和H32，其中可焊性和对燃料及温和化学品的耐蚀性比峰值强度更重要。.
其他用途 包括船用配件和非主承力船体结构（在指定时使用H116/H321）、食品饮料容器和封盖、压力容器，以及需要耐蚀性配合中等强度和良好可焊性的一般工业零件。.
5182与5052、5754、5083和6061的对比
在5xxx系家族中，5052 → 5754 → 5182 → 5083大致是一个强度递增、成型性递减的阶梯。.
| 财产 | 5182 | 5052 | 5754 | 5083 | 6061-T6 |
|---|---|---|---|---|---|
| 镁（%） | 4.0 – 5.0 | 2.2 - 2.8 | 2.6 – 3.6 | 4.0 - 4.9 | 0.8 - 1.2 |
| Manganese (%) | 0.20 – 0.50 | — | ≤ 0.50 | 0.40 – 1.0 | — |
| 抗拉强度（MPa，典型值） | 276 – 420 | 210 – 260 | 220 – 290 | 300 – 350 | ~310 |
| 屈服强度（MPa，典型值） | 145 – 395 | 160 – 195 | 130 – 190 | 215 – 260 | ~275 |
| 伸长率 (%) | 4 – 21 | 12 – 20 | 12 – 18 | 10 – 14 | 8 – 12 |
| 可热处理强化 | 否 | 否 | 否 | 否 | 是 |
| Deep drawing | Good (O/H111) | 优秀 | 良好 | 公平 | 公平 |
| 海洋腐蚀 | 非常好 | 良好 | 非常好 | 优秀 | 中度 |
| 焊接性 | 良好 | 优秀 | 优秀 | 优秀 | 良好 |
| 机械加工性能 | 公平 | 公平 | 公平 | 公平 | 非常好 |
| Typical uses | Can ends, body panels | General sheet, tanks | Marine sheet, tread | Hull plate, cryogenic | Machined parts, frames |
Against 5052, 5182 is stronger and more dent-resistant but gives up some ultimate drawability; 5052 is also typically cheaper and easier to weld. If the part is a deep draw and strength is not binding, 5052 usually wins. If it is a body panel that has to resist denting, 5182 does. Full data is in our 5052铝合金指南.
Against 5754, 5182 is the stronger of the two with comparable corrosion behavior; 5754 is the more established European grade and appears more often in marine sheet and tread plate.
Against 5083, 5182 is more formable and easier to draw, while 5083 is stronger and is the grade classification societies expect for primary marine structure. Our 5083 aluminum guide covers that side of the comparison, and the 船用级铝材 overview shows how the 5xxx marine alloys divide applications between them.
Against 6061, the comparison flips on process: 6061 is heat-treatable, machines well, and reaches higher strength, but its welded joints lose strength and its seawater corrosion resistance is worse. 6061 is the right call for machined parts and frames; 5182 is the right call for formed and welded sheet. See the 6061铝材指南.
When 5182 Is the Wrong Choice
Stated as conditions rather than part names, since the conditions are what actually decide it.
Specify 5182 when:
- The part is a can end, easy-open end, or pull tab — H19 is the industry standard for a reason.
- You need automotive body panel strength with real drawability, and dent resistance matters.
- The part is formed and welded rather than machined, in a corrosive or food-contact environment.
- Service temperature stays below 65 °C, or warm zones are isolated.
- You need more strength than 5052 or 5754 can give without going to 5083’s lower formability.
在以下情况下另寻他选：
- Sustained service exceeds ~65 °C in a corrosive environment. Beta-phase sensitization is not reversible — use 5052 or 5454.
- The part is a deep draw at the limit of what 5052 can do. 5052 draws further and costs less.
- Primary marine structure is involved. Classification rules expect 5083 or 5086, not 5182.
- The part is machined from solid at volume. 6061 or 2011 runs faster and cheaper.
- Decorative anodizing is the finish. Use 5005 or 6063.
- Peak heat-treatable strength is required and welding is minimal. 6061-T6 or 7075-T651 outperforms any 5xxx alloy.
Standards, Equivalents, and Documentation
| 标准 | 适用于 1370 铝线的标准： |
|---|---|
| ASTM B209 | Aluminum and aluminum-alloy sheet and plate |
| EN 573-3 | Chemical composition (Europe) |
| EN 485-2 | Mechanical properties of sheet and strip (Europe) |
| GB/T 3880 | Sheet, strip and plate (China) |
| JIS H4000 | Sheet, strip and plate (Japan) |
| GMW15192 | Automotive aluminum sheet — OEM-level requirements |
| AWS A5.10 / D1.2 | Filler metal classification and structural weld design |
| ASTM B928 | High-magnesium marine plate (where H116/H321 is specified) |
Equivalent designations: UNS A95182, EN AW-5182, AlMg5 (some references).
On the purchase order, four things carry the weight. State the temper explicitly — O, H111, H32, H34, and H19 are not interchangeable. Name the governing standard, since B209 and EN 485-2 minimums are not the same numbers. Request a mill test certificate (MTC) to EN 10204 3.1 listing actual tensile, yield, and elongation for the batch. And if the material is for automotive panels or can stock, specify the property window that actually matters — r-value and n-value for drawing, or coil-to-coil consistency for high-speed can lines — rather than relying on tensile range alone.
Most 5182 problems are specification problems: a temper left open, a standard left unnamed, or a forming-critical property never asked for.
Working With Linsy Aluminum
Linsy Aluminum供应 5182 铝 as sheet and coil in O, H111, H32, H34, and H19, with H116 and H321 available for marine-oriented supply — as with other high-magnesium grades, the marine tempers are flat-rolled specifications and are not produced in bar. In-house capability covers CNC machining, welding, laser cutting, and surface finishing; forging is coordinated through partner process facilities rather than run in-house, so allow for it in planning if your part needs it.
Every shipment carries a mill test certificate (MTC), and SGS testing can be arranged on request. For automotive panel or can stock work, tell us which properties govern — r-value, n-value, or coil consistency — so the inquiry goes to the mill with the right window attached. For non-stock dimensions, typical lead time is 10–60 days, and we support low minimum order quantities on trial and prototype builds.
Send your drawing or specification and we will confirm available tempers, gauges, tolerances, and documentation, and flag anything in the service conditions that points to a different alloy.
结论
5182 is the strongest of the commonly supplied formable 5xxx alloys, and it holds two markets that pull it in opposite directions: H19 can stock at very high strength and low elongation, and automotive sheet in O through H34 chosen for how far it draws. Pick the temper first, because the spread across tempers is wider than the difference between many alloys. Respect the 65 °C ceiling, since 4.0–5.0% magnesium leaves less margin than most grades. And design welded joints on annealed HAZ properties rather than parent-temper values. Get those three right and 5182 is a capable, well-documented alloy with deep supply behind it. Get them wrong — H19 specified for a deep draw, warm continuous service, or a weld sized on H34 strength — and the failure will look like a material problem when it was a specification problem.
常见问题
What is 5182 aluminum mainly used for?
Two dominant applications. The largest globally is can end stock — beverage can ends, easy-open ends, and pull tabs — supplied in the H19 temper. The second is automotive body panels such as hoods, doors, fenders, and inner panels, in O through H34. Note that can bodies are usually a 3xxx alloy such as 3004; 5182 is the 最后 和 选项卡 material.
How strong is 5182 aluminum?
It depends entirely on temper, and the spread is wide: roughly 276 MPa tensile / 145 MPa yield / 21% elongation in O, versus about 420 MPa tensile / 395 MPa yield / 4% elongation in H19. Automotive body panel tempers sit in between — H32 around 290–315 MPa tensile and 210–230 MPa yield, H34 around 331 MPa and 255 MPa.
Is 5182 stronger than 5052?
Yes, meaningfully. 5182-H34 reaches about 331 MPa tensile against roughly 210–260 MPa for 5052-H32, with correspondingly higher yield. The trade-off is formability and cost: 5052 draws further in deep-draw work, welds a little more easily, and is usually cheaper. Choose 5182 when strength or dent resistance governs; choose 5052 when maximum drawability or cost governs.
Can 5182 aluminum be welded?
Yes, by MIG and TIG, typically with ER5356 filler, or ER5183 where higher as-welded strength is needed. The important caveat is that 5182 is non-heat-treatable, so the heat-affected zone is annealed by welding and cannot be restored — welded joints are weaker than H-temper parent metal, and joints should be sized on annealed HAZ properties per AWS D1.2.
What is the maximum service temperature for 5182?
About 65 °C（150 °F） for continuous service in corrosive environments. Above that, the 4.0–5.0% magnesium content can precipitate at grain boundaries as the beta phase, leading to intergranular corrosion and stress corrosion cracking. The change is not reversible by heat treatment, so for warm sustained service specify 5052 or 5454 instead.
Is 5182 good for deep drawing?
In the soft tempers, yes. 5182-O and H111 offer around 18–21% elongation and draw well for automotive inner panels, tank ends, and stamped shells. It does not draw quite as far as 5052, and it work-hardens faster, so expect more force, larger bend radii, and possibly interstage annealing on multi-step draws. For exposed automotive panels, specify r-value and n-value, not just elongation.
What is the difference between 5182-H19 and 5182-H32?
They are at opposite ends of the temper range and are not interchangeable. H19 is heavily cold-rolled to maximum strength — about 420 MPa tensile, 395 MPa yield, only 4% elongation — and is used for can ends and pull tabs, where the operation is punching and scoring rather than drawing. H32 is strain-hardened and stabilized to about 290–315 MPa tensile and 210–230 MPa yield with 10–12% elongation, and is used for automotive body panels and structural sheet.
