Aluminum alloy temper types

1. Basic Statuses

1.1 Status Subdivisions

1.2 H Subdivision Statuses

1. The first digit after H indicates the basic process used to achieve the status, represented by 1–4.

2. The second digit after H indicates the final degree of work hardening of the product, represented by digits 1–9. Digit 8 represents the hard state.

3. The third digit or letter after H indicates characteristics that affect the product but keep the properties close to those of the two-digit state (except for H112, H116, H321 states).

H Subdivision Statuses

HX1 ~ HX9 Statuses

1.3 T Subdivision Statuses

1. The digits 1–10 after T indicate the basic treatment state.

2. The digits or letters after T1–T10 indicate special treatments that affect product characteristics.

3. The "51, 510, 511, 52, 54" appended after T_ indicate stress relief states.

T Status – Basic Treatment States

T1 ~ T10 with Additional Digits or Letters for Special Treatments Affecting Product Characteristics

Stress Relief States (T_ with "51, 510, 511, 52, 54")

1.4 T Status Heat Treatment Verification States

• T1 status material converted to T42 status through aging;

• T1 status material converted to T62 status through aging;

• T3 status material converted to T82 status through aging;

• T4 status material converted to T62 status through aging;

• T4 status material converted to T762 status through over-aging;

• T6 status material converted to T732 status through over-aging;

• T351 status material converted to T42 status through re-solution heat treatment.

1.5 W Status Subdivision

Aluminum Alloy Old and New Status Comparison Table (Former Status Codes According to GB340-76)