GB/T 26059-2010Titanium and titanium alloy halftone (English PDF)

3.1.1 Grade, condition and specification

The grade, the condition and the specification of the product shall comply with the requirements of Table 1. The table lists the commercially pure grades TA1, TA2, TA3, TA8, TA8-1, TA9, TA9-1 and TA10 together with the alloy grade TC1; the supply conditions cold-worked (Y), annealed (M) and cold-flattened annealed (ZM); and, for each combination, the sheet thickness, the width and length of the mesh sheet, and the long pitch, short pitch and strand width of the mesh aperture. Two notes add that the supply condition shall be stated in the contract and that, where it is not stated, the product is supplied in the cold-worked condition, and that mesh of other specifications and grades may be supplied by agreement when the purchaser asks for it. The dimensions themselves are in the standard.

3.1.2 Shape of the product

The shape of the product is as shown in Figure 1: a rectangular mesh sheet of stated length and width, with the mesh aperture called out, and a detail view of a single diamond aperture giving the long pitch, the short pitch, the strand width and the section through a strand.

3.1.3 Designation example

The designation of the product is written in the order product name, grade, condition, specification and standard number. Clause 3.1.3 gives a worked example for a mesh made of TA1 in the cold-flattened annealed condition, of a stated sheet thickness, mesh width, mesh length and aperture, written out in the form "Mesh TA1 ZM ... - ... GB/T 26059-2010".

3.2 Chemical composition

The chemical composition of the mesh shall comply with the provisions for the relevant grade in GB/T 3620.1. Where the purchaser asks for a check analysis, the permissible variations of the chemical composition shall comply with the provisions of GB/T 3620.2.

3.3.1 Dimensional tolerances

The dimensions and permissible deviations of the mesh sheet are as specified in Table 2, and the permissible deviations of the dimensions of the mesh aperture are as specified in Table 3. Table 2 is set out by sheet thickness and gives the thickness tolerance together with the tolerances on the width and the length of the sheet; Table 3 is set out by long pitch and gives the tolerances on the long pitch, the short pitch and the strand width. The values themselves are in the standard.

3.3.2 Cutting

The mesh sheet shall be cut square, every corner being cut to a right angle, and the out-of-square shall not exceed the permissible deviations on the width and the length of the mesh sheet.

3.3.3 Flatness

Clause 3.3.3 fixes the flatness of the mesh sheet in the cold-worked condition and in the annealed condition, and separately the tighter flatness of the mesh sheet in the cold-flattened annealed condition, in each case together with the maximum distance by which a corner may stand off the flat plate. No obvious local bending of the mesh sheet is allowed. The values themselves are in the standard.

3.4.1 Strands

No broken strands and no delamination are allowed on the mesh sheet.

3.4.2 Surface appearance

The mesh sheet shall have a bright surface after alkali and acid treatment and pickling; no oxide skin is allowed, but slight darkening and local water marks are permitted.

3.4.3 Surface defects

No macroscopic defects such as cracks, scabs, folds, or metallic and non-metallic inclusions, and no traces of over-pickling or over-alkali washing, are allowed on the surface of the mesh sheet.

3.5 Microstructure

Where the purchaser asks for it and it is stated in the contract (or order form), the mesh may be supplied batch by batch with the measured values of the grain size, including the metallographic photographs.

5.1 Inspection and acceptance

The product shall be inspected by the quality department of the supplier, which guarantees that the quality of the product complies with this standard and with the provisions of the contract (or order form) and fills out a quality certificate.

The purchaser shall inspect the product received against the provisions of this standard; where the inspection result does not agree with this standard and with the provisions of the contract (or order form), the purchaser shall raise the matter with the supplier within three months of the date on which the product was received, and it shall be settled by negotiation between supplier and purchaser.

5.2 Batching

The product shall be submitted for inspection in batches, each batch being made up of product of the same grade, the same melting furnace number, the same specification, the same condition and the same heat treatment furnace (batch).

5.3 Inspection items and sampling

The inspection items and the sampling of the product shall comply with the provisions of Table 4. The table pairs each of the four inspection items - chemical composition, dimensions and permissible deviations, surface quality and microstructure - with the sampling rule for it and with the clause numbers of the requirement and of the test method: one sample per batch for the hydrogen content, the other constituents being reported from the ingot analysis unless the purchaser asks for sampling on the product; sheet by sheet for the dimensions and for the surface quality, with the thickness measured before the mesh is stamped; and two sheets per batch for the microstructure, one aperture being chosen on each sheet and one specimen taken across the strand and across the strand junction.

6.1 Product marking

A label shall be attached to the product that has passed inspection, carrying the following: the grade; the specification; the supply condition; and the batch number.

6.2 Packaging, transport and storage

The packaging, the package marking, the transport and the storage of the product shall comply with the provisions of GB/T 8180.

6.3 Quality certificate

Each batch of product shall be accompanied by a quality certificate stating: the name of the supplier; the name of the product; the grade, the specification and the condition of the product; the melting furnace number, the batch number, the batch weight and the number of pieces; the results of each of the specified analyses and inspections and the seal of the quality inspection department; the number of this standard; and the packaging date.