1.4301 Data Sheet thyssenkrupp Materials (UK)

Stainless steel 304 and stainless steel 304L are also known as 1.4301 and 1.4307 respectively. Type 304 is the most versatile and widely used stainless steel. It is still sometimes referred to by its old name 18/8 which is derived from the nominal composition of type 304 being 18% chromium and 8% nickel. Type 304 stainless steel is an austenitic grade that can be severely deep drawn. This property has resulted in 304 being the dominant grade used in applications like sinks and saucepans. Type 304L is the low carbon version of 304. It is used in heavy gauge components for improved weldability. Some products such as plates and pipes may be available as “dual certified” material that meets the criteria for both 304 and 304L. 304H, a high carbon content variant, is also available for use at high temperatures. Properties given in this data sheet are typical for flat-rolled products covered by ASTM A240/A240M. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this data sheet.

Application

• Saucepans

• Springs, screws, nuts & bolts

• Sinks & splash backs

• Architectural panelling

• Tubing

• Brewery, food, dairy and pharmaceutical production equipment

• Sanitary ware and troughs

Supplied Forms

• Sheet

• Strip

• Bar

• Plate

• Pipe

• Tube

• Coil

• Fittings

Alloy Designations

Stainless steel grade 1.4301/304 also corresponds to: S30400, 304S15, 304S16, 304S31 and EN58E.

Corrosion Resistance

304 has excellent corrosion resistance in may environments and when in contact with different corrosive media. Pitting and crevice corrosion can occur in environments containing chlorides. Stress corrosion cracking can occur above 60°C.

Heat Resistance

304 has good resistance to oxidation in intermittent service up to 870°C and in continuous service to 925°C. However, continuous use at 425- 860°C is not recommended. In this instance 304L is recommended due to its resistance to carbide precipitation. Where high strength is required at temperatures above 500°C and up to 800°C grade 304H is recommended. This material will retain aqueous corrosion resistance.

Fabrication

Fabrication of all stainless steels should be done only with tools dedicated to stainless steel materials. Tooling and work surfaces must be thoroughly cleaned before use. These precautions are necessary to avoid cross contamination of stainless steel by easily corroded metals that may discolour the surface of the fabricated product.

Cold Working

304 stainless steel readily work hardens. Fabrication methods involving cold working may require an intermediate annealing stage to alleviate work hardening and avoid tearing or cracking. At the completion of fabrication a full annealing operation should be employed to reduce internal stresses and optimise corrosion resistance.

Hot Working

Fabrication methods like forging, that involving hot working should occur after uniform heating to 1149-1260°C. The fabricated components should then be rapidly cooled to ensure maximum corrosion resistance.

Machinability

304 has good machinability. Machining can be enhanced by using the following rules: Cutting edges must be kept sharp. Dull edges cause excess work hardening. Cuts should be light but deep enough to prevent work hardening by riding on the surface of the material. Chip breakers should be employed to assist in ensuring swarf remains clear of the work. Low thermal conductivity of austenitic alloys results in heat concentrating at the cutting edges. This means coolants and lubricants are necessary and must be used in large quantities.

Heat Treatment

304 stainless steel cannot be hardened by heat treatment. Solution treatment or annealing can be done by rapid cooling after heating to 1010- 1120°C.

Weldability

Fusion welding performance for type 304 stainless steel is excellent both with and without fillers. Recommended filler rods and electrodes for stainless steel 304 is grade 308 stainless steel. For 304L the recommended filler is 308L. Heavy welded sections may require post-weld annealing. This step is not required for 304L. Grade 321 may be used if post-weld heat treatment is not possible.

Social media users on TikTok have been confused about why some people say or hashtag the number 304 on their videos. TikTok is an app for all ages, which means that talking about inappropriate subject matters can lead to your account getting disabled or deleted.

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Since users have to be very careful about what they talk about and post, they’ve come up with safe words, codes, and terms that allow them to discuss the subjects they care about most — even if those subjects might not be appropriate for the platform. So, what exactly does 304 mean? Here’s what you should know next time you see the hashtag on TikTok.

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What does "304" mean on TikTok?

If you type the number 304 into a calculator and flip it upside down, it’s supposed to look like the word "h--." Whenever TikTokers are describing someone as a 304, they’re trying to say that person is a h--.

The top Urban Dictionary definition for 304 states it's “a way you can call a thot or b---h a h-- without actually calling her that.” This certainly isn’t the only codeword TikTokers use when they want to talk about topics — or use language — that could get them kicked off the app.

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What are the other codewords and terms used on TikTok?

When someone on TikTok claims to be an “accountant,” it typically means that they work as an exotic dancer. "Accountants" on TikTok gain a lot of popularity by sharing their day-in-the-life videos, including how much cash they earn after performing on stage. If they were to tell their followers their real job title, they'd likely get removed from the video-sharing app.

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TikTok "accountants" don’t only show off bags of cash. They also occasionally share fashion hauls of the costumes they wear on stage, makeup and hair tutorials on how to achieve their glamorous looks, and sometimes, swanky-looking pole tricks if they have poles in their homes. Many "accountants" avoid filming stage tricks at their actual job locations.

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"Accountants" on TikTok who only dance are quick to explain how they differ from 304s. Dancing on stage and sex work are obviously two very different things and TikTok "accountants" will be the first to explain the difference.

“SW” are the letters used by sex workers to describe their professions on TikTok. As of now, they haven’t been banned for talking about their experiences as long as they use the two discrete letters whenever they tell their stories.

Hopefully, the TikTok terms SW, accountant, and 304 should make a lot more sense now!