Ξ

News

Credibility ,
the lifeblood of enterprise!
PRODUCT SERIES
Your Location: Home > News
News - Yaang

Stainless Steel 304L (UNS S30400)

DataTime:[6/25/2014]

SPECIFICATIONS: GRADE 304 / 304L | UNS S30400 / 30403 | ASTM/ASME A240 | Werkstoff 1.4301 / 07

304L is one of the most widely used and versatile stainless steel pipes, Stainless Steel Pipe Fittings and Stainless Steel Flanges at Yaang Pipe Industry Co., Limited is certified to 304/304L. We are a supplier who can provide stainless steel 304L from stock in sheet, plate, or bar direct from our warehouse and distribute it meeting all cutting and profiling requirements across the world.

This stainless steel grade is found in a variety of commercial sectors, particularly in the chemical industry. It is a sort after material for use in severely corrosive conditions, it is used in heavy gauge components for improved weldability, weld annealing is only necessary in applications where stress loads are excessive.

304L Stainless Steel is characterised by:

  • Basic corrosion resistance
  • Resistance against intergranular corrosion
  • High ductility

Technical information:

Stainless steel 304L is an 18Cr-9Ni austenitic stainless steel. The grade contains small amount of ferrite (≈ 3%) after solution annealing (1000-1100°C – 1832-2012°F) and water quenching.

This kind of steel is one of the basic grades of the stainless steels range. Its low carbon content ensures better ductility and avoids the intergranular corrosion, even on welded pieces without ulterior water quenching.

Stainless steel 304L exhibits austenitic microstructures free of deleterious carbide precipitations at grain boundaries.

Typical values (weight %)
C Cr NI Mo N Others
0.020 18.5 9.2 - 0.05 -
PREN (%Cr+3.3%Mo+16%N) ≥ 18

Nickel content may be modified to be conform to 1.4306 grade.

Tensile properties after water quenching
°C °F Minimum guaranteed values * Typical values El %
Y.S. 0.2% Y.S. 1% UTS Y.S. 0.2% Y.S. 1% UTS
MPa Ksi MPa Ksi MPa Ksi MPa Ksi MPa Ksi MPa Ksi
20 68 200 29 240 35 520/
650
75/
95
265 38 305 44 570 83 45
100 212 147 21 181 26 410 60 240 34 280 40 480 70 40
200 392 115 17 147 21 360 52 220 32 240 34 440 63 35
300 572 100 15 127 19 340 50 170 25 190 27 420 62 35
400 752 89 13 116 17 330 48 150 22 165 24 400 58 30
500 932 81 12 109 16 320 47 130 20 145 21 380 56 30

* Following EN 10088 hot rolled plates – The EN guaranteed values are valid for a thickness from 5-75mm. Mechanical properties are related to the thickness of the plate.

Impact values: KCV ≥ 120 j/cm² (room temperature)
°C -196 -20 +20 θ (°C) 200 400 600
°F -321 -4 68 θ (°F) 392 752 1112
KCV (J/cm²)
Minimum
125 160 180 Ageing H 265 257 252
KCV (J/cm²)
Typical
220 250 250 KCU (J/cm²)
Transverse
158 142 122

Typical values

High toughness values at -269°C (-452°F) need specific melts (extra low ferrite content).

Interval
temper
°C
Thermal
expansion
αx10-6K-1
°C °F Resistivity
(µΩ cm)
Thermal
conductivity
(W.m-1.K-1)
Specific
heat
(J.kg-1.K-1)
Young
modulus
E
(GPa)
Shear
modulus
G
(GPa)
20-100 16 20 68 73 15 500 200 77
20-200 17 100 212 77 16 500 194 75
20-300 17 200 392 84 17.5 520 186 71
20-400 18 300 572 91 19 530 179 68
20-500 18 400 752 97 20.5 540 172 65
500 932 102 22 540 165 62
Quality corrosion tests guaranteed (special request may be discussed)
TEST Other name Corrosion (1) Results
ASTM A 262 A Intergranular Step or dual structure
ASTM A 262 B STREICHER Intergranular Not recommended
ASTM A 262 C HUEY Intergranular < 0,6mm/year*
ASTM A 262 E
DIN 50914
STRAUSS Intergranular No cracking after bending
ASTM G48 A Pitting Not recommended
(typical CPT = 5°C-41°F)
ASTM G48 B ASTM G78 Crevice Not recommended
(typical CCT ≤ 0°C-32°F)

(1) kind of corrosion mechanism investigated

* Using low ferrite grade.

The alloy is not really resistant to localised corrosion in chloride containing solutions. Pitting may occur even at low temperature (5-10°C – 41-50°F).

The alloy is very prone to stress corrosion cracking in chloride containing solution when temperature is higher than 50°C (122°F).

Stainless steel 304L is corrosion resistant in:

  • Urban media
  • Nitric solution, up to 55% weight, up to 80°C (176°F) (low ferrite)
  • Most of diluted organic acids at moderate temperatures
  • Most of food and pharmaceutical products
  • Pure phosphoric acid
    • Whatever concentration in cold solution
    • Up to 10% diluted hot solution sulphuric or fluoridric acid traces increase the corrosion
  • Caustic solutions free of chlorides or fluorides at medium temperatures

The alloys are not corrosion resistant in chloride containing solutions, even diluted, and in sulphuric acid media.

So, the main applications are:

  • Food processing industry (excluding Cl – containing media)
  • Diluted nitric acid solution
  • Nuclear industry (special melts; please consult)

Tel No:+86-18267732328 / Fax No :86-0577-56809281 / Email:sales@yaang.com
Address:Longwan District, Wenzhou, Zhejiang Province, China.

Copyright Notice © Yaang.com Yaang Pipe Industry Co., Limited All rights reserved.