Steel grade characteristics of NSSC FW1 - Stemcor

Stemcor Stainless (UK) is the 

agent and sales channel for 

NSSC’s FW grades 

in the UK and Ireland

Introducing new products from NSSC 

Copyright© 2011 NSSC. All Rights Reserved. 

Materials Design of FW Series 

1

Sn Added, Extra-low interstitial Ferritic Stainless Steel 

― The FW Series 

~ Resource-saving and highly corrosion resistant NSSC® FW1 and FW2 ~ 


2

Basic Technology Underlying the NSSC FW Series 

~ Effects of adding Sn ~ 

Effects of Sn on corrosion 

resistance 

Appearance after 168 hr immersion test 

14 Cr (for comparison) 

Immersed 168 hrs in a 0.5% NaCl water solution at 80ºC 

30mm x 30mm, with #600 polish finish 


2~5 

nm 

Schematic of Sn's 

form of existence based on 

results of surface analyses 

Passivity 不働態皮膜 film 

(Fe,Cr) 2O3 + (Sn-O,Sn) 

Metal 金属母地 substrate 

(Cr-Sn-Low C,N) 

Cr 

incrassation 

Cr 

濃化 

3

FW1 and FW2 – Corrosion resistance and formability, 

an exceptional combination 

409L 

430 

Copyright© Source : 2010 2011 NSSC. All All Rights Reserved. Reserved. 

NSSC FW1 

Corrosion Resistance 

304 

NSSC FW2 

(14Cr-0.1Sn-LC,Nb) (16Cr-0.3Sn-LC,Nb) 

441 

→Excellence 

316 

Schematic Illustration 

Ferritic type 

Austenitic type

Advantages and steel grade characteristics of NSSC FW1 

[Advantages] 

NSSC FW1 (Forward 1) 14Cr-0.1Sn-LC, N 

1. While FW1 is a 14% Cr steel, it delivers corrosion and rust resistance that is 

equal to or better than 17% Cr (NSSC 430D and TP439) steels. A small amount 

of Sn is added to strengthen the passivity film. 

2. FW1 offers among the best formability of our high-purity ferritic steels, and 

excellent post-forming surface properties (anti-ridging). 

3. Thorough alloy-saving efforts have been made (Ni and Mo-free, reduced Cr 

content, and appropriate content of trace elements) to minimize the effects of 

fluctuating raw material prices. 

[Chemical composition] (Mass%) 

Grade 

values 

Representative examples 

[Mechanical characteristics] 

C Si Mn P S Cr Sn Nb+Ti N 

13.75 0.10 

0.010 0.50 0.50 0.040 0.030 ~ 15.00 ~ 0.25 10(C+N) 0.015 

0.004 0.12 0.10 0.024 0.001 14.4 0.11 0.20 0.010 

Yield strength 0.2% offset 

(N/mm) 


Tensile strength 

(N/mm) 

Elongation 

(%) 

Hardness 

(HV) 

Grade values 175 360 28 180 


260 420 35 130 

(Surface finish: 2B, thick plate; 0.6mm, JIS13B, L direction) 

5

Pitting 

resistance 

potential 

Steel grade characteristics of NSSC FW1 

Good 

↑ 

Potential at which pitting 

occurs (Vv.s.AGCL) 

Appearance after 

salt spray test 


~ Corrosion resistance ~ 

Tp.430 

(17Cr) 

Tp.430 

(17Cr) 

SUS430LX 

(17Cr-Ti-LC) 

SUS430LX 

(17Cr-Ti-LC) 

#600 polish 

TIG + #600 polish 

NSSCFW1 

(14Cr-0.1Sn-LC) 

Continuously sprayed for 168 hrs with a 5% NaCl water solution at 35ºC, Complies with JISZ2371. 

50mm x 100mm, with #600 polish finish 

Pitting resistance 

potential of Tp304 

(18cr-8Ni) 

The corrosion resistance of NSSC FW1 (14Cr-0.1Sn-LC) is superior to SUS430XL (17Cr-Ti-LC) 

6

NSSC FW1 steel grade characteristics 

~ Formability and moldability ~ 

Limit drawing value (cylinder drawing test) 

良 

↑ 

Good 

Limit draw ratio 

限界絞り比 

2.30 

2.25 

2.20 

2.15 

2.10 

2.05 

2.00 


(14Cr-0.1Sn-LC) 


(14Cr) 

Surface roughness after press forming (Cylinder drawing) 


(14Cr-0.1Sn-LC) 

SUS430LX 

(17Cr-TI-LC) 

SUS430LX 

(17Cr) 

SUS430LX 

(17Cr-Ti-LC) 


LDR level 

of Tp304 

Tp.430 

(17Cr) 

SUS430 

(17Cr) 

良 

↑ 

エリクセン高さ,mm 

Flangeability (Erichsen test) 

Tp304 level: ~ 14mm 

10 

Good 

Erichsen height, mm 

9 

8 

7 

6 


(14Cr-0.1Sn-LC) 

SUS430LX 

(17Cr-Ti-LC) 

Tp430 

(17Cr) 

NSSC FW1 SUS430LX SUS430 

NSSCFW1 (14 Cr - 0.1 Sn-LC) 

offers better formability than 

SUS430LX (17 Cr-Ti-LC), with less 

surface roughness after it is formed. 

(Thickness: 0.6mm, draw rate: 2.0) 

7



~ Characteristics of welded areas ~ 

Flangeability of TIG welded areas 

Good (Erichsen test) 

Erichsen height, mm ↑ 

Good 

↑ 

Welding heat input, J/cm 

H=60・E・I/v 

H:溶接入熱(J/cm),E:アーク電圧(V) 

I:溶接電流(A),v:溶接速度(cm/min) 

H: Welding heat input (J/cm), E: Arc voltage (V), 

I: Weld current (A), v: Weld speed (cm/min) 

Corrosion resistance of TIG welded areas 

(salt water immersion test) 

NSSCFW1/TIG unfinished 

SUS430LX (NSSC 430D)/TIG unfinished SUS430/TIG unfinished 

● Test conditions: TIG welding was performed so that an uranami bead 

of about 1.5mm is made. 

Surface condition: TIG welded and unfinished (2B), and TIG welded 

and polish finished to #600 

Immersion solution and time: 168 hrs in 0.5% NaCl solution at 80ºC 

NSSC FW1 (14Cr-0.1Sn) can be TIG welded under the same conditions as SUS 

430LX (17CR), a conventional extra-low interstitial ferritic steel. 

Formability and corrosion resistance of the welded areas are also good. 

8

Stainless steel composition 


Advantages of NSSC FW1 

Reduce rare metal content by 

Iron 

Nickel 

Chrome 

SUS304 

Major generic 

steel grade 

23% 

SUS430LX 

Generic Niless 

steel grade 

Rate of reduction in chrome content 

9

Sn Added, Extra-low interstitial Ferritic Stainless Steel 

― The FW Series 

~ Resource-saving and highly corrosion resistant NSSC FW2 ~ 


Nippon Steel & Sumikin Stainless Steel Corporation 

10

Advantages and steel grade characteristics of NSSC FW2 

[Advantages] 

1. While FW2 is a 16% Cr steel, it delivers corrosion and rust resistance that is 

equal to that of SUS304 (18C-8Ni) under regular conditions. 

2. FW2 offers among the best formability of ferritic steels. By selecting the 

appropriate forming conditions (drawability), FW2 offers mold formability 

equal to that of SUS304. 

3. Thorough alloy-saving efforts have been made (Ni, Mo, and Cu-free, reduced 

Cr content) to minimize the effects of fluctuating raw material prices. 


NSSC FW2 (Forward 2) 16Cr-0.3Sn-LC, N 

[Chemical composition] (Mass%) 

Grade 

values 


C Si Mn P S Cr Sn Nb+Ti N 

15.75 0.3 

0.010 0.50 0.50 0.040 0.030 ~ 17.00 ~ 0.45 10(C+N) 0.015 

0.005 0.07 0.06 0.02 0.001 16.4 0.31 0.22 0.01 

[Mechanical characteristics] 

0.2% bearing force 

(N/mm) 

Tensile strength 

(N/mm) 

Elongation 

(%) 

Hardness 

(HV) 

Grade values 205 390 25 200 

Representative examples 279 463 32 144 

(Surface finish: 2B, thick plate; 0.6mm, JIS13B, L direction) 

11

Steel grade characteristics of NSSC FW2 

~ Corrosion resistance 1~ 

Improved salt spray corrosion test (salt water environment) 


(16Cr-0.3Sn) 

Test sample shape: 50 x 100 with top end bent at 90º angle. Surface: Finished at 

#600 

Solution: 24 hrs in 0.5% NaCl + 2% H 2O 2 at 35ºC. Other conditions comply with 

JISZ2371 

Rust resistance in salt water environments was greatly 

improved over SUS430 and is equal to that of SUS304. 


SUS304 

(18Cr-8Ni) 

SUS430 

(17Cr) 

12

Various formability characteristics of NSSC 

FW1 and FW2 

Formability (plate thickness: 0.6mm) 

By selecting the appropriate forming conditions, NSSC FW1 

and FW2 can be mold formed in the same way as SUS304. 


Drawability Bulge expandability 

Average 

r value 

LDR n value 

Hydraulic bulge 

height (mm) 

NSSC FW1 1.7 2.3 0.22 31.5 

NSSC FW2 1.7 2.3 0.24 30.5 

SUS430 1.0 2.0 0.16 27.0 

SUS304 1.1 2.1 0.42 40.5 

13



Results from comparative simulations of moldability under the same conditions 

SUS304;h=52mm 

Blank: 240 x 240mm 

Punch: 100 x 100mm, 

Corners: r 20mm, rp 10mm 

Die: 103 x 103mm, rd 5mm 

Friction coefficient: 0.10, Plate thickness: 0.8mm 

Fold pressure: 20 tons 


Crack 

NSSC 180;h=24mm 

NSSC FW1;h=32mm 

14

Apply high lubrication film 

Smaller fold pressure 



Results from simulations of moldability under appropriate conditions 

Fold pressure: 10 tons Fold pressure: 10 tons 

NSSC 180; 

H=52mm 

NSSC 180; 

H=52mm 


NSSC FW1; 

h=60mm 

Friction coefficient: 0.06 Friction coefficient: 0.06 

NSSC FW1; 

h=60mm 

15

Steel grade characteristics of NSSC FW2 


Multi-drawing characteristics ~ Appearance after multi drawing ~ 

4 th stage 

drawing 


(16Cr-0.3Sn) 

3 rd stage 

drawing 


SUS304 

(18Cr-8Ni) 

 

J4(14Cr-1Ni-Mn) 

Plate thickness: 0.6mm (cold-finished once) Blank diameter: 80mm Lubricant: J.W. #122 

Punch diameters (mm): 1st stage 40 2nd stage 35 3rd stage 30 4th stage 25 

NSSC FW2 leads to forming by multi-drawing without 

developing any cracks. 

Season cracking occurs with SUS304. 

16

100% 

26% 

18% 

16% 

Advantages of NSSC FW2 -Resource-saving- 

Rare metal (Cr, Ni) use can be reduced by 40%. 

Fe 

Iron 

8%Ni 

Nickel 

Stainless steel composition Small amounts of added Sn improves corrosion resistance, and thereby 

0% 

18%Cr 

Chrom 

e 

18%Cr-8%Ni 

SUS304 (generic steel) 


・Equal corrosion 

resistance 

・Good 

formability 

・Good 

weldability 

Fe 

Iron 

16%Cr 

Chrom 

e 

16%Cr-0.3Sn 


0% 

40% 

100% 

←Rate of reduction in rare metal content 

17

IH (induction-heating) rice cookers 

Lithium-ion battery cases 

(Deep drawing applications) 


Examples of NSSC FW1 applications 

Large rectangular vats 

Candidate applications for NSSC FW1 

Washing 

machine drums 

Rice washing bowls 

Building materials and 

architectural members 

Hinges 

18

Examples of NSSC FW2 applications 

Kitchen sinks Cooking trays 

Yukihira pan 


Expanded metal 

(mesh) 

All existing applications where 

SUS304 (18 Cr-8 Ni) is used are 

candidate applications for FW2. 

19

Range of manufacturability of cold-finished 

products from NSSC FW1 and FW2 

Shape Thickness (mm) Width (mm) Length (mm) 

Cutlength sheets 0.3 ~ 4.0 300 ~ 1,250/1524 8,000 max. 

Coils 0.3 ~ 4.0 200 ~ 1,250/1524 

* Available in high-gloss 2B finish. 

* A variety of finishes, including BA, are also available. 

* Please inquire for dimensions and specifications not 

shown here. 


20

Nikkei Excellent Product or Service Award 2010 

~ NSSC FW1 is awarded the Grand Award in the Nikkei Sangyo Shimbun Awards ~ 

坂村健先生内館牧子氏 

Copyright© 2011 NSSC. 2011 All Rights NSSC. Reserved. 

All Rights Reserved. 

"The fact that the stainless steel sheets 

developed by Nippon Steel & Sumikin 

Stainless Steel Corporation addresses 

the resource-scarce situation in Japan is 

worthy of much praise." 

"One of the more important products were 

the stainless steel sheets developed by 

Nippon Steel & Sumikin Stainless Steel 

Corporation. This is a good example of 

industry addressing the issue of resource 

scarcity and their fluctuating supply." 

日経産業新聞 2011.2.5 より 

21

Product 

type 

Thin 

sheets 

Thick 

sheets 

Copyright© 2011 NSSC. 2011 All Rights NSSC. Reserved. 

All Rights Reserved. 

Primary characteristics 

Corrosion 

resistance 

Corrosion 

resistance 

Mold 

formability 

Strength 

NSSC 

suggestions 

FW Series 

Duplex 

stainless steel 

22

Steel grade characteristics of NSSC FW1 - Stemcor

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