SS304 vs SS304L

E Steel support local market , Import and export small or low quantity of stainless steel plate, stainless steel round bar, stainless steel sheets, stainless steel block, stainless steel flat bar and cut to size as customer demands.

E Steel Sdn Bhd currently in placed addresses the high mix small volume demands on metal material over global supply chain, while our logistic strengths resolve those ad-hoc deliveries demands.

According to Chemical Compositions of the content of chromium and nickel, 304 stainless steel is made up of 18% chromium (Cr) and 8% nickel (Ni), but the main difference is the carbon content.

Chemicals (%) of 304, 304L and 304H

Grade C Mn Si P S Cr Mo Ni N
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

What’s the difference between 304, 304H and 304L?

304L is ultra-low carbon stainless steel, the carbon content is reduced to less than 0.03%, which can avoid intergranular corrosion, and theoretically the effect of stress corrosion resistance is stronger than 304, but the effect is not obvious in practical applications. The purpose of reducing carbon and adding titanium is the same, but the 321 smelting cost of adding titanium is higher, the steel is thicker, and the price is more expensive.
H in 304H refers to high temperature, high carbon content is the guarantee of high temperature strength. GB150 requires austenitic steel to be used at 525 ° C or more, carbon content is not less than 0.04%, carbide is strengthening phase, especially high temperature strength. Better than pure austenite.
Among the three, the highest carbon content is 304H, and the lowest carbon content is 304L, while the 304 stainless steel has a carbon content between the two. The higher the carbon content, the worse the corrosion resistance of stainless steel and the easier it is to rust. The difference in carbon content also causes the price to vary, or the different requirements for that sentence.

The two main variants of grade 304 are the low carbon form 304L and the high carbon form 304H.
304L has a maximum of 0.30% carbon. This reduces the tendency for carbide precipitation when welding. Carbide precipitation can result in intergranular corrosion.
304H has between 0.04 and 0.1% carbon. This gives it greater strength at high temperature but does make it more vulnerable to carbide precipitation when welding.
Since 304 has as having a maximum of 0.08% carbon, there are potential overlaps in the specifications which means that it is not uncommon to find dual specification.
304L clearly has less than 0.08% carbon and can, therefore, be described as 304/304L.
304 may have up to 0.08% carbon so if its carbon content is between 0.04 and 0.08% carbon it can be described as 304/304H.

Mechanical properties of 304, 304L, 304H
304304L 304H mechanical performance table - What's the difference between 304, 304H and 304L?

Low Mang Kok B: Klang, Selangor, 18.12.1973; P: Low Chong Seng 1948; Lee Sok Yen 1952; MS: Chua Hooi Koon 1976; Ch: Low Chun Leong 1998; Low Chun Ee 2002; E: 1980 - 1985 SJK (C) Pin Hua 1 - Primary School; 1986 - 1991 SM Kwang Hua - Secondary School; 1992 - 1993 College WIT - Electronic technician; Ca: 1992 - 1993 Lion Suzuki Motor Sdn. Bhd. - Sales Executive; 1993 - 1994 Great Eastern Life Assurance (Malaysia) Berhad - Insurance Agent; 1994 - 1998 Kimwin Special Steel Sdn. Bhd. - Sales Executive; 1998 - 2000 ASSAB Steels (Malaysia) Sdn. Bhd. - Sales Engineer ; 2000 - 2004 Kimwin Special Steel Sdn. Bhd. - Freelancer Sales ; 2004 - 2010 EE TECK Marketing - Founder and Managing Director; 2010 - 2019 E Steel Sdn. Bhd - Founder and Managing Director; WaCW: Global Business Magazine - Asia Pacific Top Excellence Brand 2011; International Prestige Brand Award Book & Record 2017; Aw: Asia Pacific Top 100 Excellence Brand In Year 2011; International Prestige Brand Of The Year 2017; Me: China Entrepreneur Club; LS: English, Malay, Mandarin, Cantonese, Teochew, Hokkien; H: Gardening; Online Marketing; PMM: To develop Steel business globally through online new business model; RoS: Self discipline; Keep learning and always look for solution instead focus on problem; Web: www.esteelsuppliers.com Your index: Industry, Trade and Services Successful People in Malaysia (2nd Edition) Release date: December 2020 ( BPH - British Publishing House Ltd )