SHEET METALWORK DATA Aluminium 1050A (S1B) SHEET
TYPICAL APPLICATIONS
General sheet metal work Packaging Boilermaking Heat transfer devices Kitchenware Chemical industry Pharmaceutical industry Automotive industry Architecture Cabinets Appliances Vessels Panelling
COLD FORMABILITY
1050A H14 has good formability and is the ideal specification when bending or spinning is required with fair strength. The bending data detailed below is a guideline only for cold bends and will vary depending on the exact bending practices carried out. We recommend the tables below as a starting point only for your own application and not as part of the design process. For a simple guide use the table below multiply the thickness of the sheet in mm by the bending factor to give a minimum bending radius. Simple bending guidelines: Sheet thickness/mm Over Up to and including 0.5 1.5 1.5 3.0 3.0 6.0 6.0 12.0 Minimum bending factor 180 90 1.0 0.5 1.0 1.0 1.5 1.5 2.5
PRODUCT DESCRIPTION
An unalloyed (pure) non-heat treatable rolled aluminium sheet engineered for general sheet metal work where high mechanical properties are not required.
TECHNICAL DESCRIPTION
Internationally recognised grade EN AW 1050A H14 99.50% pure aluminium (Al 99.5) sheet strain hardened to the half-hard temper. The previous BS specification was known as S1B and the half-hard temper was known as H4, giving S1B H4. Smiths range of 1050A will meet all appropriate national/international standards.
Therefore, a 90 bend in 4mm sheet would require a minimum bend radius of 4 x 1.5 = 6mm. Detailed bending guidelines: cold 90 bend made with the axis normal to the rolling direction. Sheet thickness/mm Plate 0.5 1.0 1.5 2.0 3.0 4.0 5.0 6.0 8.0 10.0 Minimum Inner radius of the bent sheet after spring-back/mm 0.3 0.5 1.0 1.5 2.5 3.8 5.5 7.5 13 18 Sheet spring-back guidelines. The ratio of spring-back, factor k, is defined as the ratio of the bending angle after spring-back to that before spring-back was permitted. The spring-back is dependant on the ratio of the bending radius after spring-back to the sheet thickness. The table below will allow factors of k to be estimated. Ratio of bending radius to sheet thickness 1 2 4 6 10 15 Spring-back factor, k 0.98 0.98 0.97 0.95 0.93 0.90 30 0.80 60 0.65
PRODUCT ATTRIBUTES
Good surface finish Very good anodising qualities Very good corrosion resistance Capable of cold forming
CUSTOMER BENEFITS
Excellent aesthetics Ideal for sheet metal work applications which do not need high strength Ideal for welding fabrication Components are easier to manufacture/assemble and have closer tolerances Uneconomic cutting to size and stockholding costs are removed your highly skilled operators and resources are used more efficiently
Very good welding qualities Close tolerance sheet
Close tolerance cut to size service for both cut blanks and circles/rings Immediate or just-in-time delivery
Therefore, an attempted 90 bend on a bend radius of 18mm using 3mm thick sheet would give a ratio of bending radius to sheet thickness of 18/3 = 6. Looking up this ratio of 6 gives a spring-back factor of 0.95. After bending was complete the sheet would have only bent 0.95 x 90 = 85.5. To have achieved a 90 bend the sheet would have to have been bent to an original angle of 90/0.95 = 95 in the first instance.
NOMINAL COMPOSITION %
Al Min Max 99.50 0.25 0.40 0.05 0.05 0.05 0.07 0.05 0.03 Si Fe Cu Mn Mg Zn Ti Others each
WELDING
1050A is easily welded by MIG or TIG processes, with a recommended filler metal of 1050A (S-Al99.5) or 4043A (S-AlSi5) for welding to 1050A structures. A good weld is likely to have a strength of up to 65Mpa, although this will be dependant on the type and quality of welding.
SURFACE TREATMENT
Grade 1050A has very good anodising properties for both decorative and technical requirements. It is also well-suited to chemical and electrolytic brightening.
CUT TO SIZE GUILLOTINED BLANKS
Edge deviation over cut length/width (maximum thickness 6.35mm) 0.2mm per m
CUT TO SIZE SAWN BLANKS
Edge deviation over cut length/width (minimum thickness 3mm) mm +1.5,-0
MACHINING
Pure aluminium has only fair machinability due to the softness of the alloy. The half-hard temper increases the hardness over the annealed/soft base alloy but could not be described as free chipping compared to the harder, alloyed aluminiums. We recommend aluminium geometry cutting tools running at a reasonable speed to avoid the edge build-up which can occur at lower cutting speeds. High speed steel tools may be more economical than carbide, particularly with the possibility of a large rake angle on machines which cannot reach carbide cutting speeds.
The single source for all your engineering materials. 12 Material Centres throughout the UK.
Biggleswade Select
CUT TO SIZE CAPABILITY
Smiths Metal Centres carry a full range of 1050A in both imperial and metric sizes. Our close tolerance high capacity guillotines can cut accurately to exact customer requirements, whether that be 1 blank or 10,000 blanks. The cut blanks will be delivered immediately when cut or just in time to meet your schedules. We can also stamp or turn circles or rings to your specifications as part of our first stage engineering capability.
Tel: 01767 604704
Fax: 01767 600466 Biggleswade Metal Centre
Tel: 01767 604604
Fax: 01767 315271
VINYL COATING
Smiths can supply aluminium sheet vinyl-coated for surface protection during machining, bending and fabrication. Our CNC vinyl coating line can apply a variety of coatings and colours dependent on your exact requirements.
Birmingham Metal Centre
Tel: 0121 327 5511
Fax: 0121 327 4060 Bristol Metal Centre
CORROSION RESISTANCE
Unalloyed aluminium sheet has very good corrosion resistance and can be used in normal, industrial and marine environments without problems. Where the sheet is being specifically used in marine environments it may be worthwhile reviewing alloyed aluminium grades, such as 5251 (NS4), which may be generally more suitable to marine environment applications.
Tel: 0117 971 2800
Fax: 0117 971 6300 Chelmsford Metal Centre
Tel: 01245 466664
Fax: 01245 465916 Ferndown Metal Centre
Tel: 01202 893755
Fax: 01202 893712
TYPICAL MECHANICAL PROPERTIES
Tensile strength Yield strength Shear strength Elongation Brinell Hardness Thermal conductivity Melting range Electrical conductivity Coefficient of thermal expansion Elastic modulus N/mm2 N/mm2 N/mm2 % (A50) HB W/m.K C %IACS 1/K MPa 100-135 Min 75 (approx. only) 70 4-8 35 229 645-657 58.4 23.5x10-6 69000
Horsham Metal Centre
Tel: 01403 261981
Fax: 01403 241820 Leeds Metal Centre
Tel: 0113 277 6887
Fax: 0113 271 0226 London Metal Centre
Tel: 020 7241 2430
Fax: 020 7254 9608 Norwich Metal Centre
Tel: 01603 789878
Fax: 01603 788973 Nottingham Metal Centre
The mechanical properties of (unalloyed) 1050A are low. The corollary of this is the good forming properties of this grade. If both forming and higher mechanical properties are required then we recommend the potential selection of grades 3103 (NS3) or 5251 (NS4). In general the better mechanical properties the lower the formability.
Tel: 0115 925 4801
Fax: 0115 925 5370
THICKNESS TOLERANCES
Thickness tolerances after cutting
Specified nominal sheet thickness Sheet base width up to 1000mm Sheet base width over 1000mm up to and including 1250mm >0.2 >0.4 >0.5 >0.6 >0.8 >1.0 >1.2 >1.5 >1.8 >2.0 >2.5 >3.0 >3.5 >4.0 >5.0 >6.0 0.4 0.5 0.6 0.8 1.0 1.2 1.5 1.8 2.0 2.5 3.0 3.5 4.0 5.0 6.0 8.0 0.02 0.03 0.03 0.03 0.04 0.04 0.05 0.06 0.06 0.07 0.08 0.10 0.15 0.18 0.20 0.24 0.04 0.04 0.05 0.06 0.06 0.07 0.09 0.10 0.11 0.12 0.13 0.15 0.20 0.22 0.24 0.30
Tyneside Metal Centre
Tel: 0191 469 5428
Fax: 0191 495 0116
www.smithmetal.com
When measuring the thickness, a zone 10mm wide from the edges of the product shall be disregarded.
Nationwide suppliers of all forms of non-ferrous metals, stainless steel and engineering plastics.
All information in this data sheet is based on appropriate testing and is stated to the best of our knowledge and belief. It is presented apart from contractual obligations and does not constitute any guarantee of properties or of processing or application possibilities in individual cases. Our warranties and liabilities are stated exclusively in our terms of trading. ISSUE 1 AMB 10K 12/03
