PSI - Issue 37

Aleksandar Sedmak et al. / Procedia Structural Integrity 37 (2022) 263–268 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 1. Vertical Kaplan turbine in hydro power plant “Djerdap 1” Turbaine cover consists of 4 segments (marked as 2-1, 3-2, 3-4 i 4-1), Fig. 2, made by welding of steel St 3, sl. 2. Chemical composition according to Russian standard GOST 380-94, [18], is shown in Tab.1, and basic tensile properties, according to GOST 14637-89, [19], in Tab. 2.

a)3D model

b) segment 4-1, back view

c) Segment 4-1, 3D model

d) segment 4-1, front view

Fig. 2, Turbine cover

Table 1. Chemical composition of steel St. 3. Standard C Si

Mn

S (max)

P (max)

GOST 380-94

0.14-0.22 0.15-0.3

0.4-0.65

0.05

0.05

Table 2. Mechanical properties of steel St. 3. Standard

R p0,2 [N/mm

2 ] R

m [N/mm

2 ] A

5,65 [  ]

GOST 14637-89

min. 235

370 - 480

min. 25