李青, 崔利民, 史咏鑫, et al. Quality Control of Ultra-pure 316H Austenitic Stainless Steel Forgings for Nuclear Power[J]. Special Steel, 2022, 43(3): 30-34.DOI:
The process of ultra - pure 316H steel for nuclear power produced by 20 t EAF-AOD-LF-VD-Φ430 mm elecrode-Φ590 mm ESR ingot-homogenizing treating-Φ310 mm forged bar flowsheet is studied by means of composition calculation
smelting process and electroslag slag analysis
homogenization annealing process test and other methods. When the composition satisfies 0. 042% ~ 0. 047% C
≤ 0. 55% Si
1. 60% ~ 1. 80% Mn
17. 00% ~ 17. 30% Cr
12. 20% ~ 12. 40%Ni
2. 50% ~2. 60% Mo
≤ 5 x10
-6
H
≤ 30x 10
-6
O
0. 055% ~0.070%N
the Φ430 mm electrode is remelted with CaF
2
: Al
2
O
3
: CaO =60%: 30%: 10% slag syst
em electroslag into Φ590 mm ESR ingot
then homogenization treated at 1 200 ~ 1 250 °C for 30 h
it can produce products to meet the standards
that is inclusion rating units- A and C being 0
B
thin
0.5
B
thick
being 0
D
thin
1. 0
D
thick
0 -0. 5 and Ds being (0 ~0.5) ;ferrite content ≤ 0. 5% .