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AZ31B is a wrought magnesium base alloy with good room-temperature strength and ductility combined with corrosion resistance and weldability. Increased strength is obtained by strain hardening with a subsequent partial anneal (H24 and H26 tempers). Our sheet and plate’s size range is:

Sheet: thickness: 1-- 6mm; Width: 600mm max.; Length: 6000mm max;

Plate: thickness: 6-- 200mm; Width: 2800mm; Max. length is 6000mm;

Block: We can supply cut-to-size blocks according to customer’s requirements.

Coil: thickness from 0.5 to 2.7mm, max. width 330mm;

APPLICATIONS

Sheet and plate in AZ31B find application in medium strength service at temperatures below 150°C. Diverse uses including aerospace, aircraft, concrete tools, 3C (cell phone / camera / computer), speaker cones and textile machinery can all benefit from light weight AZ31B.

AZ31B is non-magnetic and has high electrical and thermal conductivity filling the requirements for RFI and EMI shielding in the electronics and computer industries.

Superplastic forming of AZ31B sheet at elevated temperatures allows production of a wide variety of intricate parts for automotive uses. Monocoque construction utilizing formed sheet can be adapted to many commercial applications.

SPECIFICATIONS

ASTM B90/B90M-07

AMS 4375

AMS 4376

AMS 4377

CHEMICAL COMPOSITION

Al: 2.5-3.5%

Zn: 0.7-1.3%

Mn: 0.20 – 1.0%

Mg: Balance

PHYSICAL PROPERTIES

Density: 1.78

Coefficient of thermal expansion: 26.8 x 10^-6K^-1

Specific heat: 1040 Jkg^-1k^-1

Thermal conductivity: 76.9Wm^-1k^-1

Electrical resistivity: 92nΩm

Modulus of elasticity: 45 x 10⁹Pa

Poissons ratio: 0.35

Melting range: 566 - 632°C

HEAT TREATMENT

No thermal treatment is available for increasing the strength of this alloy after fabrication.

WELDABILITY

Excellent weldability with gas shielded arc using AZ61A (preferred) or AZ92A filler rod; post weld stress relief is required to prevent stress corrosion cracking. Resistance welding is excellent.

MACHINING

AZ31B, like all magnesium alloy sheet and plate, machines faster than any other metal. Providing the geometry of the part allows, the limiting factor is the power and speed of the machine rather than the quality of the tool material. The power required per cubic centimeter of metal removed varies from 9 to 14 watts per minute depending on machining operation.

DENT RESISTANCE

Weight for weight, AZ31B-H24 has proven to be superior to competitive materials in its resistance to denting at moderate energy levels.

Dent Resistance of 1mm Gauge Sheet (Dent depth in mm from 25mm spherical redius indentor on 350mm span)