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Acier inoxydable 303 : composition, caractéristiques, prix et applications

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Usinage de l'inox 303

Aperçu

En développant une expertise spécialisée dans le moulage méticuleux de l'acier inoxydable 303, nous soulignons notre engagement inébranlable envers l'éminence dans le domaine de la fabrication métallique. Utilisant une technologie d'avant-garde et une main-d'œuvre compétente, nous nous distinguons par les procédures alambiquées impliquées dans le moulage de composants en acier inoxydable 303.

Nos compétences dans le moulage de l'acier inoxydable 303 englobent un large éventail de méthodologies, incluant le moulage, le coulage et la finalisation. Cette grande perspicacité nous permet de surmonter les tribulations distinctives présentées par cette qualité d'acier inoxydable, garantissant des résultats exceptionnels en termes de qualité et d'efficacité.

Soucieux d’un dévouement sans faille à l’assurance qualité, nous adhérons fermement à des normes strictes tout au long du continuum de casting. Cet engagement garantit la précision, l'uniformité et la fiabilité attendues par notre clientèle. Optez pour nos services pour vos besoins de moulage en acier inoxydable 303 et soyez témoin de l'impact transformateur que notre compétence et notre dévouement inébranlable envers l'éminence peuvent conférer à vos entreprises.Acier inoxydable 303 1

Qu'est-ce que l'acier inoxydable 303 ?

303 stainless steel is in fact, free-machine variant of the common austenitic 18/8 stainless steel (namely, 304 stainless steel). This form has added sulfur or selenium to increase its machinability characteristic, which makes it better to cut, drill, and do all machining operations compared to the standard 304 grade stainless steel. Sulfur or selenium modification causes the formation of chips as internal tearing points, thus, improving the chip formation process and reducing the tool life. Machinability of 303 stainless steel is good. Though 303 stainless steel has less corrosion resistance and weldability compared to 304 stainless steel. The material is often used in machining where there are many machining procedures, such as turning, tapping, and milling of parts.

Quelles sont les caractéristiques de l’acier inoxydable de la série 300 ?Acier inoxydable 303 2

The 300 series stainless steels which include 304and 316 grades are characterized by good corrosion resistance, non-magnetic properties in the annealed state and high ductility, strength, and formability, making them suitable materials for different applications. This property is due to the presence of chromium, and as such they have resistance to chlorides in the sea or in brackish water. Because of their attractive formability and high-temperature resistance, they are perfect for manufacturing complex products and demanding applications where the parts are subjected to high temperatures, like heat exchangers and exhaust systems. These so-called stainless steels are widely used throughout the automotive, aerospace, food processing, chemical, architectural, and medical industries because of the combination of properties that they offer, enabling them to operate in situations requiring that combination.

Quelles sont les différences entre l'acier inoxydable des séries 200, 300 et 400 ?

The 200,300, 400 series of stainless steel have compositional differences, corrosion resistance, magnetic properties and applications. The 200 series is made of chromium, nickel, and manganese which present some minor corrosion resistance, being at the same time non-magnetic. On the other hand, 300 series which is known due to its composition from chromium and nickel, stands out as a material with excellent corrosion resistance property, non-magnetic property, as well as versatility for various industries. In the 400 series, with chromium as the primary alloying metal, it shows a lesser degree of corrosion resistance and is magnetic, hence, commonly used in cutlery and decorative trims. In general, the 200 series is used for the cookware and the 300 series is highly applicable for the corrosion resistance and wide availability, therefore, the 400 series is intended for the magnetic applications that require a moderate corrosion resistance.Acier inoxydable 303 3

Composition chimique de l'acier inoxydable 303

ComposantWt.%
Carbone (C)0,0 – 0,15 %
Chrome (Cr)18.0 %
Fer (Fe)69.0 %
Manganèse (Mn)0.0 – 2.0 %
Molybdène (Mo)0 – 0.6 %
Nickel (Ni)9.0 %
Phosphore (P)0.0 – 0.2 %
Silicium (Si)0.0 – 1.0 %
Soufre (S)0.15 %

L'influence de la composition élémentaire sur les propriétés de l'acier inoxydable 303Acier inoxydable 303 4

Elemental composition being a key factor, the properties of stainless steel 303 largely depend on the type of the material. Unlike the tool steel 18-8 (304) grade which is a free-machining version of the basic austenitic 18-8 stainless steel, this grade contains sulphur or selenium added to improve machinability. The sulfur and selenium inclusions are present, and such characteristics act as chip breakers that aid chip formation by diminishing tool wear. Even though this alloy is a bit less corrosion resistant and weldable than normal 304 stainless steel. Indeed it is, however, stainless steel 303 has excellent general corrosion resistance, mechanical properties, as well as formability, that make it suitable for numerous applications, including screw machining, fittings, shafts, valves, and fasteners which need extensive machining operations. Therefore, when the component has the right alloy composition and atomic distribution, machinability is optimized, but preservation of the other important properties, say, corrosion resistance, becomes a challenge.

Propriétés mécaniques de l'acier inoxydable 303

Propriétés mécaniquesMétriqueAnglais
Résistance à la traction ultime690 MPa100000 psi
Résistance à la traction415 MPa60200 psi
Allongement à la rupture40 %40 %
Dureté, Rockwell B9696
Dureté, Brinell228228
Dureté, Knoop251251
Dureté, Vickers240240
Module d'élasticité193 GPa28000 ksi
Module de cisaillement77,2 GPa11200 ksi

Propriétés physiques de l'acier inoxydable 303Acier inoxydable 303 5

Propriétés physiquesMétriqueAnglaiscommentaires
Densité8,0 g/cc0,289 lb/in²
Propriétés électriques
Résistivité électrique7.2e-005 ohm-cm7.2e-005 ohm-cm
Perméabilité magnétique1.0081.008à RT
Propriétés thermiques
CDT, linéaire 20°C17,2 µm/m-°C9,56 µin/in-°Fde 0 à 100°C
CTE, linéaire 250°C17,8 µm/m-°C9,89 µin/in-°Fà 0-315°C (32-600°F)
CTE, linéaire 500°C18,4 µm/m-°C10,2 µin/in-°Fà 0-540°C, 18,7 µm/mC à 0-650°C
Capacité thermique0,5 J/g-°C0,12 BTU/lb-°Fde 0-100°C (32-212°F)
Conductivité thermique16,2 W/mK112 BTU-in/hr-ft²-°Fà 100°C (212°F), 21,5 W/mK à 500°C (930°F)
Point de fusion1400 – 1420 °C2550 – 2590 °F
Solidus1400°C2550 °F
Liquide1420°C2590 °F

Matériaux équivalents à l'acier inoxydable 303Acier inoxydable 303 6

UEEtats-UnisJaponFranceAngleterreSuède
FRJISAFNORBSSS
X8CrNiS18-9 (1.4305)303SUS303Z8CNF18-09303S312346

Le prix de l’acier inoxydable 303

The price of 303 stainless steel is determined by other things like market demand, availability of raw materials, manufacturing costs, and existing economic conditions. Normally, 303 stainless steel is cheaper relative to other high-grade stainless steels such as 304 or 316, because it is simpler in composition and its nickel content is lesser. Nevertheless, there is an on-going trend for prices to change in reaction to the fluctuations of the market. To get the most recent and accurate pricing information, stainless steel suppliers can be consulted or industry publications, which keep track of metal prices on a regular basis, can be referred to.

What Challenges are Encountered in Processing Stainless Steel 303?Acier inoxydable 303 7

Stainless steel 303 though being machined is far better than austenitic standard stainless steels but still needs special attention. Contemporary problems may comprise the adverse effects of hardening induced by the machining process, scuffing in high loads, and the presence of sulfur inclusions that negatively affect surface finish and mechanical properties. However, weldability difficulties arise after sensitization of welded joints and need for post-weld heat treatments or low-carbon filler metal. The attainment of a smooth surface finish, is sometimes challenging due to hardening and sulfur inclusions which requires proper tooling and processing. The right chip management is a vital requirement to prevent chip agglomeration and tool jamming during the machining process. As a whole, these problems require good control of machining parameters, preferable selection of tools and efficient process optimization to gain the wished part quality and productivity levels.

Applications de l'acier inoxydable 303

L'acier inoxydable 303, réputé pour sa résistance à la corrosion et son usinabilité, joue un rôle essentiel dans diverses industries :Acier inoxydable 303 8

Dans chaque application, l'usinage de l'acier inoxydable 303 s'avère avantageux, offrant un mélange harmonieux de résistance à la corrosion et de facilité d'usinage, ce qui en fait le matériau de choix pour les pièces complexes.

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