3105 aluminum<\/a> is the 3000-series alloy that sits between 3003 and 5052 \u2014 it adds a small amount of magnesium to the Aluminium<\/a>-manganese base, gaining a modest strength bump over 3003 while keeping the same basic formability, corrosion resistance, and weldability. It is widely used in construction, roofing, siding, and HVAC ductwork. This guide covers where 3105 is a good fit, when to step up to 5052, and what to check before ordering.<\/p>\n 3105 is an Al-Mn-Mg system with low copper and controlled impurities:<\/p>\n 3105 is non-heat-treatable \u2014 all strength gains come from strain hardening (cold working). In the H14 temper (half-hard), tensile strength is approximately 150\u2013200 MPa with yield strength around 130\u2013160 MPa. In the H19 temper (full-hard), tensile strength reaches approximately 215\u2013260 MPa. The strength bump over 3003 is modest (typically 10\u201320 MPa) but meaningful in thin-gauge applications where every MPa counts.<\/p>\n 3105 bends, roll-forms, and stamps well across most common tempers. The alloy is commonly produced in sheet and coil for continuous forming operations \u2014 roofing panels, siding profiles, and gutter systems are typical production targets. Deep drawing is better in softer tempers (H12\/H14); tight-radius bending should be checked in H19.<\/p>\n 3105 provides good resistance to general atmospheric corrosion, mild chemical exposure, and moisture. It performs well outdoors in architectural and construction applications without cladding \u2014 the low copper content keeps the corrosion risk manageable. It is not rated for direct saltwater immersion.<\/p>\n 3105 welds readily with standard aluminum processes \u2014 GTAW (TIG), GMAW (MIG), and resistance welding all work. Filler alloys 4043 or 1100 are commonly used, and post-weld strength in the HAZ is lower than the cold-worked base metal (as expected for any non-heat-treatable alloy).<\/p>\n 3003 is the baseline aluminum-manganese alloy. 3105 adds magnesium, gaining roughly 10\u201320 MPa in tensile strength across equivalent tempers. The trade-off is minimal \u2014 formability and corrosion resistance are nearly identical. Choose 3105 when the slightly higher strength helps reduce gauge thickness or meet a wind-load requirement; choose 3003 when absolute maximum availability and lowest cost matter more.<\/p>\n 5052 is the step up: higher tensile strength (~230 MPa in H34 vs. 3105-H14’s ~170 MPa), better corrosion resistance, and full marine service capability \u2014 but at a higher cost. 3105 covers general construction and architectural applications; 5052 becomes the right choice when structural loads are higher or the environment is more aggressive.<\/p>\n 1100 is commercially pure aluminum \u2014 maximum corrosion resistance and formability, minimal strength. 3105 is the higher-strength option in the 3xxx range while retaining most of 1100’s corrosion performance. For architectural sheet where some structural stiffness is needed, 3105 is the more practical grade.<\/p>\n Use this quick reference to decide whether 3105 fits your application.<\/p>\n Go \u2014 use 3105 when:<\/strong><\/p>\n No-Go \u2014 do not use 3105 when:<\/strong><\/p>\n The Go\/No-Go criteria above cover selection logic. The list below maps specific systems where 3105 is standard practice:<\/p>\n 3105 aluminum is the practical 3000-series upgrade from 3003 \u2014 it adds a modest strength boost from magnesium while keeping the same formability, corrosion resistance, and weldability that make the 3xxx family the default choice for construction and architectural sheet metal. The limits are real: it cannot be heat-treated, it is not marine-grade without coating, and its anodizing appearance is less uniform than 6xxx alloys.<\/p>\n Linsy Aluminum supplies 3105 in sheet, coil, and custom-dimension plate, with low-MOQ production available for non-stock specifications. Full MTC documentation accompanies every order, and SGS testing for composition and mechanical properties is available on request. If the project requires a specific temper, gauge, or coil width, send the specification for a technical review.<\/p>\n 3105 contains magnesium (0.2\u20130.8%) while 3003 does not. This addition increases tensile strength by roughly 10\u201320 MPa in equivalent tempers. Formability, corrosion resistance, and weldability are nearly identical \u2014 the choice usually hinges on whether the extra strength helps meet a structural or gauge-reduction target.<\/p>\n Yes \u2014 3105 is readily weldable with GTAW (TIG) and GMAW (MIG). Filler alloys 4043 or 1100 are commonly used. As with all non-heat-treatable alloys, the cold-worked strength is reduced in the heat-affected zone, so design should account for lower local strength near welds.<\/p>\n 3105 provides good resistance to general atmospheric corrosion and is widely used in unpainted roofing and siding applications. It is not suitable for direct saltwater immersion or chemically aggressive environments. For coastal construction, a protective coating or a move to 5052 is recommended.<\/p>\n Yes \u2014 coil is the most common product form for 3105, supporting continuous roll-forming, stamping, and sheet metal fabrication lines. Standard tempers H14 and H19 are typical; custom gauge and width combinations require specification confirmation with the mill.<\/p>\n While technically possible, the anodized finish on 3105 is less uniform than on 6xxx-series alloys due to the manganese and magnesium content. For applications where anodizing quality is visually or functionally critical, 6061 or 6063 are stronger candidates \u2014 or specify a painted\/coated finish on 3105 instead.<\/p>","protected":false},"excerpt":{"rendered":" Introduction 3105 aluminum is the 3000-series alloy that sits between 3003 and 5052 \u2014 it adds a small amount of magnesium to the aluminum-manganese base, gaining a modest strength bump over 3003 while keeping the same basic formability, corrosion resistance, and weldability. It is widely used in construction, roofing, siding, and HVAC ductwork. This guide […]<\/p>\n","protected":false},"author":1,"featured_media":8178,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"3105 Aluminum Alloy: Properties, Tempers, and Comparison Guide (3003 vs 5052)","_seopress_titles_desc":"Practical guide to 3105 aluminum alloy covering H14\/H19 tempers, formability limits, welding, and comparisons with 3003, 5052, and 1100. 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Wichtige Eigenschaften<\/h2>\n
Strength and Work Hardening<\/h3>\n
Verformbarkeit<\/h3>\n
Korrosionsbest\u00e4ndigkeit<\/h3>\n
Schwei\u00dfeignung<\/h3>\n
H\u00e4ufige Temperamente<\/h2>\n
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3105 vs. Other Alloys<\/h2>\n
3105 vs. 3003<\/h3>\n
3105 vs. 5052<\/h3>\n
3105 vs. 1100<\/h3>\n
Go\/No-Go Limits<\/h2>\n
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Anwendungen<\/h2>\n
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Schlussfolgerung<\/h2>\n
H\u00e4ufig gestellte Fragen<\/h2>\n
Was ist der Unterschied zwischen Aluminium 3003 und 3105?<\/h3>\n
Can 3105 aluminum be welded?<\/h3>\n
How does 3105 perform in outdoor environments?<\/h3>\n
Is 3105 available in coil form?<\/h3>\n
Can 3105 be anodized?<\/h3>\n