GB/T 25151.4-2010Fabrication and inspection method for high pressure urea equipment - Part 4: Intergranular corrosion tendency test specimen preparation for ultra low-carbon chromated nickel molybdenum austenitic stainless steel of urea grade (English PDF)

2.1 specimen and sample representativeness

Specimens and samples should be representative of products, consistent with the corresponding state manufacturing. In the manufacturing process, when the material needs to feed

When the row above 500 °C temperature heat treatment or other special treatment, the specimen should be subjected to the same treatment.

2.2 specimen and the surface state of the sample

Specimens and surface state of the sample, the final surface state of the product should be made fairly. Sample board, pipe, when the required cutting,

Keep at least a non-cutting surface in contact with corrosive process media.

2.3 welding specimens and samples

When the manufacture of welded specimens, the welding method, welding parts, welding parameters, welding material grades, specifications and furnace (batch) numbers, and the product should be

The same welding, weld samples generally welded condition tested.

Preparation 3 specimens and samples

Interception 3.1 specimens and samples 3.1.1 intercepted specimens should allow sufficient margin can be cut, saw and plasma from the material - arc cutting method, the specimen is at least enough

To be subdivided into two samples.

3.1.2

from the specimen when test specimens shall show that the rolling or forging direction perpendicular to the direction of the cross-sectional area accounts for one half of the surface area the following.

3.2 Preparation of test pieces and samples

3.2.1

specimens and specimen preparation requirements shall be in accordance with Table 1 and Figure 1.

GB/T 23711.8-2019 | HG/T 4752-2014 | HG/T 20584-2011 | GB/T 25151.6-2014 | GB/T 25151.3-2010 | GB/T 25151.2-2010 | […]