Tensile testing

Tensile testing is the primary method for determining the strength properties of metals and alloys. A tensile testing machine gradually stretches the specimen until fracture.

We determine yield strength and ultimate tensile strength — key parameters for component and structural design

Two main characteristics are recorded during testing: • Yield strength — the stress at which deformation increases without an increase in load • Ultimate tensile strength — the maximum stress the material withstands before fracture

Ductility characteristics are also determined: elongation and reduction of area after fracture. The method follows GOST 1497-84. Results support material certification, incoming inspection and research.

Impact testing

Impact testing determines a material’s resistance to brittle fracture. A notched specimen is fractured by a single strike from a pendulum impact tester.

Tests are performed at room and reduced temperatures, down to −60 °C

Main characteristics: • KCU — a U-notched specimen • KCV — a V-notched specimen (a more sensitive method) For low-temperature testing, specimens are held at the specified temperature in a cooling chamber immediately before the test.

The method is governed by GOST 9454-78. Results are particularly important for materials used at low temperatures, including northern-climate equipment, cryogenic systems and bridges.

Hardness testing

Hardness measurement is one of the most common quality control methods for metals after heat treatment and machining. The laboratory uses three main methods.

Brinell, Rockwell and Vickers — all in one laboratory

• Brinell (HB) — indentation using a steel or carbide ball. Used for relatively soft materials such as non-ferrous metals and unhardened steel. • Rockwell (HRA, HRB, HRC) — indentation using a diamond cone or ball. The most common method for monitoring heat treatment. • Vickers (HV) — indentation using a diamond pyramid. Used for thin layers, small components and the hardness of individual microstructural constituents.

Metallographic examination

Metallographic examination reveals internal metal structure, detects defects and assesses heat treatment quality.

Microstructural and macrostructural analysis — a comprehensive assessment of metal quality

• Microstructure examination — microscopy at magnifications up to 2,000×. Assesses the shape, size and distribution of constituents such as ferrite, pearlite and austenite, grain size and non-metallic inclusions. • Macrostructural analysis — detects defects visible to the naked eye or at low magnification: pores, cracks, segregation, flakes and incomplete weld penetration. • Grain flow direction — checks deformation during rolling or forging. • Strengthened/hardened layer depth — checks the depth of surface hardening.

The factory laboratory of Cheboksary Enterprise Sespel CJSC holds official measurement capability assessment report No. 13-25, issued by the Chuvash Centre for Standardisation and Metrology (Rosstandart). The assessment followed MI 2427-2024 and is valid until 19 December 2028.

Official measurement capability assessment report No. 13-25

The factory laboratory of Cheboksary Enterprise Sespel CJSC holds official measurement capability assessment report No. 13-25, issued by the Chuvash Centre for Standardisation and Metrology (Rosstandart).

The certificate confirms that the laboratory has the necessary conditions for performing measurements

The assessment followed MI 2427-2024, the current standard governing laboratory measurement capability checks. The report is valid until 19 December 2028.

Registered address: Room 5, 36 Leningradskaya Street, Cheboksary, Chuvash Republic, 428032, Russia. Laboratory address: 39 Sidukovskaya Street, Sidukkasy village, Morgaushi district, Chuvash Republic, 429540, Russia.