Stainless Steel Strip Grades

The grades listed below are some common steel strip grades, their alternative specifications  and their chemical analyses.

Grade 301

Grade 301 stainless steel provides spring properties while maintaining excellent resistance to corrosion. It is an austenitic grade, which possesses spring properties in its temper rolled condition. It can be used to form springs without the need for heat treatment. 

Stock Availability

BSS Steel Strip stock grade 301 in sheet and coil, temper rolled at 380vpn.

To make an enquiry please call +44 (0)114 244 0527 (select option 2) or email bss@steelstrip.co.uk. 

Standard sheet sizes available for fast dispatch are 300x1000mm in a thickness range up to 1mm. 

Higher thicknesses and alternative sheet sizes can be supplied to order.

Coil can be supplied to specified width and weight. 

Properties and Analysis

 

The properties for Grade 301 are specified for flat rolled product (plate, sheet and coil) in ASTM A666. Similar but not identical mechanical properties are specified in EN 10088.2 and JIS G4305 and in proprietary specifications.

Typical compositional ranges for grade 301 stainless steels are given in table 1. Table 1. Composition ranges for 301 grade stainless steel
Grade C Mn Si P S Cr Mo Ni N
3011.4310 ASTM A666 min. max. – 0.15 – 2.0 – 1.0 – 0.045 – 0.030 16.0 18.0 6.0 8.0 – 0.10
301L JIS G4305 min. max. – 0.03 – 2.0 – 1.0 – 0.045 – 0.030 16.0 18.0 6.0 8.0 – 0.20
1.4318/301LN EN 10088-2 min. max. – 0.03 – 2.0 – 1.0 – 0.045 – 0.015 16.5 18.5 6.0 8.0 0.10 0.20

Grade 304

Type 304

Chemistry

GradeCMnSiPSCrMoNiN
304

min.

max.

0.08

2.0

0.75

0.045

0.030

18.0

20.0

8.0

10.5

0.10

304L

min.

max.

0.030

2.0

0.75

0.045

0.030

18.0

20.0

8.0

12.0

0.10

304H

min.

max.

0.04

0.10

2.0

0.75

-0.045

0.030

18.0

20.0

8.0

10.5

Mechanical Properties

Table 2. Mechanical properties of 304 grade stainless steel

GradeTensile Strength (MPa) minYield Strength 0.2% Proof (MPa) minElongation (% in 50mm) minHardness
Rockwell B (HR B) maxBrinell (HB) max
3045152054092201
304L4851704092201
304H5152054092201
304H also has a requirement for a grain size of ASTM No 7 or coarser.

Grade Specification Comparison

Possible Alternative Grades

GradeUNS NoOld BritishEuronormSwedish SSJapanese JIS
BSEnNoName
304S30400304S3158E1.4301X5CrNi18-102332SUS 304
304LS30403304S111.4306X2CrNi19-112352SUS 304L
304HS30409304S511.4948X6CrNi18-11

Type 316

Chemistry

Grade CMnSiPSCrMoNiN
316Min016.02.0010.0
Max0.082.00.750.0450.0318.03.0014.00.10
316LMin16.02.0010.0
Max0.032.00.750.0450.0318.03.0014.00.10
316HMin0.040.04016.02.0010.0
max0.100.100.750.0450.0318.03.0014.0

Mechanical Properties

Table 2. Mechanical properties of 316 grade stainless steels.

GradeTensile Str
(MPa) min
Yield Str
0.2% Proof
(MPa) min
Elong
(% in 50mm) min
Hardness
Rockwell B (HR B) maxBrinell (HB) max
3165152054095217
316L4851704095217
316H5152054095217

Note: 316H also has a requirement for a grain size of ASTM no. 7 or coarser.

Possible Alternative Grades

GradeUNS
No
Old BritishEuronormSwedish
SS
Japanese
JIS
BSEnNoName
316S31600316S3158H, 58J1.4401X5CrNiMo17-12-22347SUS 316
316LS31603316S111.4404X2CrNiMo17-12-22348SUS 316L
316HS31609316S51

Note: These comparisons are approximate only.

Type 310

Chemistry

GradeCMnSiPSCrMoNiN
310

min.

max.

0.25

2.00

1.50

0.045

0.030

24.0

26.0

19.0

22.0

310S

min.

max.

0.08

2.00

1.50

0.045

0.030

24.0

26.0

19.0

22.0

Mechanical Properties

GradeTensile Strength (MPa) minYield Strength 0.2% Proof (MPa) minElongation (% in 50mm) minHardness
Rockwell B (HR B) maxBrinell (HB)
max
3105152054095217
310S5152054095217
 
 

Stainless steel is not a single material but the name for a family of corrosion resistant steels. Like many scientific discoveries the origins of stainless steel lies in a serendipitous accident. In 1913 Sheffield, England, Harry Brearley was investigating the development of new steel alloys for use in gun barrels. He noticed that some of his samples didn’t rust and were difficult to etch. These alloys contained around 13% chromium.

The first application of these steels was in cutlery for which Sheffield subsequently became world famous. Simultaneous work in France led to the development of the first austenitic stainless steels.

Worldwide demand for stainless steel is increasing at a rate of about 5% per annum. Annual consumption is now well over 20 million tonnes and is rising in areas such as the construction industry and household appliances. New uses are being continuously found for the attractive appearance, corrosion resistance, low maintenance and strength of stainless steel. Stainless steel is more expensive than standard grades of steel but it has greater resistance to corrosion, needs low maintenance and has no need for painting or other protective coatings. These factors mean stainless steel can be more economically viable once service life and life-cycle costs are considered.

All stainless steel are iron-based alloys that contain a minimum of around 10.5% Chromium. The Chromium in the alloy forms a self-healing protective clear oxide layer. This oxide layer gives stainless steel their corrosion resistance. The self healing nature of the oxide layer means the corrosion resistance remains intact regardless of fabrication methods. Even if the material surface is cut or damaged, it will self heal and corrosion resistance will be maintained.

Conversely, normal carbon steels may be protected from corrosion by painting or other coatings like galvanising. Any modification of the surface exposes the underlying steel and corrosion can occur.

The corrosion of different grades of stainless steel will differ with various environments. Suitable grades will depend upon the service environment. Even trace amounts of some elements can markedly alter the corrosion resistance. Chlorides in particular can have an adverse effect on the corrosion resistance of stainless steel.

Grades high in Chromium, Molybdenum and Nickel are the most resistant to corrosion.

Stainless steel designations        
SAEUNS designation% Cr% Ni% C% Mn% Si% P% S% NOther
Austenitic          
301S3010016–186–80.1520.750.0450.03
302S3020017–198–100.1520.750.0450.030.1
302BS3021517–198–100.1522.0–3.00.0450.03
304S3040018–208–10.500.0820.750.0450.030.1
304LS3040318–208–120.0320.750.0450.030.1
304NS3045118–208–10.500.0820.750.0450.030.10–0.16
310S3100024–2619–220.2521.50.0450.03
310SS3100824–2619–220.0821.50.0450.03
314S3140023–2619–220.2521.5–3.00.0450.03
316S3160016–1810–140.0820.750.0450.030.12.0–3.0 Mo
316LS3160316–1810–140.0320.750.0450.030.12.0–3.0 Mo
316FS3162016–1810–140.08210.20.10 min1.75–2.50 Mo
316NS3165116–1810–140.0820.750.0450.030.10–0.162.0–3.0 Mo
321S3210017–199–120.0820.750.0450.030.10 maxTi 5(C+N) min, 0.70 max
Ferritic          
405S4050011.5–14.50.08110.040.030.1–0.3 Al, 0.60 max
409S4090010.5–11.750.050.08110.0450.03Ti 6 x C, but 0.75 max
429S4290014–160.750.12110.040.03
430S4300016–180.750.12110.040.03
430FS4302016–180.121.2510.060.15 min0.60 Mo (optional)
430FSeS4302316–180.121.2510.060.060.15 Se min
Martensitic          
403S4030011.5–13.00.60.1510.50.040.03
410S4100011.5–13.50.750.15110.040.03
414S4140011.5–13.51.25–2.500.15110.040.03
416S4160012–140.151.2510.060.15 min0.060 Mo (optional)
416SeS4162312–140.151.2510.060.060.15 Se min
420S4200012–140.15 min110.040.03
420FS4202012–140.15 min1.2510.060.15 min0.60 Mo max (optional)
431S4162315–171.25–2.500.2110.040.03
440AS4400216–180.60–0.75110.040.030.75 Mo
440BS4400316–180.75–0.95110.040.030.75 Mo
440CS4400416–180.95–1.20110.040.030.75 Mo