Connecting parts are used for pipelines of various purposes, including those controlled by supervisory authorities, at temperatures from minus 196 ° C to plus 700 ° C, depending on the grade of steel, in accordance with design and (or) design documentation, in which the conditions of use (operation) of parts are set based on the results of strength calculations, taking into account all external and internal force influences, properties of substances and the environment transported through the pipeline, estimated service life and (or) resource, periodicity of the volume of routine maintenance and repairs, the requirements of this standard, the norms and rules of the supervisory authorities and other regulatory documents for the design, construction and operation of pipelines.

Proposed steel grades:
carbon steel :
3, 20 (ASTM A 105 Gr1, A 106 GrA, B, A 659 CS Type 1020, A 794 CS Type 1020, EN 1.1151, AISI 1020, DIN C22E)

cold-resistant with easy weldability of steel:
09G2C (ASTM A 516-65, A 561 Gr70, A 516-55, A 516-60) (low-alloy structural for welded structures) - for cryogenic temperatures and harsh winter climatic conditions.

Heat-resistant, exposed to high temperatures of the external and internal environment, are made of steels:
10X11N23T3MR — heat-resistant high-alloy steel;
15X5M (American analogues: A 193 Grade B5, A 182 Grade F5) — heat-resistant low-alloy steel of martensitic class;
13XFA.

Made of corrosion-resistant steels. Of these steel grades can be used at chemical facilities:
10X17H13M2T (UNS S31635, AISI 318, 316H, 316Ti, DIN EN X10CrNiMoNb18-12, 1.4583, 1.4571, X10CrNiMoTi18-12, X10CrNiMoTi18-10, X6CrNiMoTi17-12-2) — heat-resistant stainless steel;
08X18H10T (AISI 321, UNS S32100, DIN EN 1.4878, 1.4541, X6CrNiTi18-10, X12CrNiTi18-9, X10CrNiTi18-9) — heat-resistant stainless steel;
10X17H13M3T (UNS S31635, DIN X10CrNiMoTi18-12, 1.4573, GX3CrNiMoCuN24-6-5, AISI 316Ti) — heat-resistant stainless steel;
10X11N23T3MR — heat-resistant stainless steel;
12X18H10T (AISI 321) — made of austenitic steel, stainless cryogenic for use in dilute solutions of acetic, phosphoric, nitric acids, solutions of salts and alkalis at temperatures from -196 to +600 ° C under pressure, with unlimited weldability;
06KHN28MDT, AISI 904L (DIN 1.4563, UNS N08028) — heat-resistant stainless steel;
14X17H2 (AISI 431, DIN X20CrNi72, X22CrNi17) — stainless heat-resistant;
20X13 (AISI 420, ASTM A 580 420, A 276 420) — stainless heat-resistant.

Proposed standards

• GOST, OST, ATK
• DIN, EN
• ANSI, ASME, API 6