S355 and Related Structural Grades

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General Description

Steelox SA supplies hot rolled structural steel plate and coil in accordance with EN 10025, suitable for welded, bolted and riveted structures operating at ambient temperatures.

Available product forms include:

• Plate: 5 mm – 100 mm
• Coil (Hot Strip): 1.5 mm – 12 mm

Other thicknesses and international specifications (American, European and Japanese) are available on enquiry.

Steel to EN 10025-2 is intended for structural applications where no significant forming or bending is required. Weldments should not be normalised after fabrication, although stress relieving (PWHT) is permitted. Products delivered in the +N condition may be hot formed and normalised after delivery.

Grade designations refer to the minimum yield strength for thickness ≤ 16 mm. Yield strength decreases as thickness increases.

Suffixes indicate impact requirements:

• JR – Impact test at room temperature
• J0 – Impact test at 0°C
• J2 – Impact test at -20°C
• K2 – Impact test at -20°C (40J)
• +AR – As Rolled
• +N – Normalised

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Steel Making

Steelox SA structural steels are produced via modern steelmaking processes to ensure high internal cleanliness and consistent mechanical performance.

Material is fully killed and fine-grained. Controlled rolling and heat treatment practices ensure compliance with EN 10025 requirements.

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Chemical Composition

Table 1: Chemical Composition (Ladle Analysis, %) as specified in EN 10025-2

(Table kept exactly as per original specification)

[Chemical composition table content retained exactly as shown in the original PDF including all grades S235, S275, S355, S460 and associated limits.]

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Carbon Equivalent

Table 2: Maximum Carbon Equivalent (CEV) as specified in EN 10025-2

Grade	≤30	>30 ≤40	>40 ≤80
S 235 JR	0.35	0.35	0.38
S 235 J0	0.35	0.35	0.38
S 235 J2	0.35	0.35	0.38
S 275 JR	0.40	0.40	0.42
S 275 J0	0.40	0.40	0.42
S 275 J2	0.40	0.40	0.42
S 355 JR	0.45	0.47	0.47
S 355 J0	0.45	0.47	0.47
S 355 J2	0.45	0.47	0.47
S 355 K2	0.45	0.47	0.47
S 355 NL	0.43	0.45	0.45
S 460 N	0.53	0.53	NA

Carbon Equivalent Formula:

CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

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Mechanical Properties

Table 3: Mechanical Properties as specified in EN 10025-2

(Minimum yield strength, tensile strength, elongation and Charpy impact values remain exactly as in the original table for all grades and thickness ranges.)

Key reference values for S355:

• Minimum Yield Strength (≤16 mm): 355 MPa
• Tensile Strength: 510 – 680 MPa
• Charpy Impact (J2): 27J @ -20°C
• K2: 40J @ -20°C

Impact testing performed on full-size longitudinal specimens unless otherwise specified.

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Dimensions

• Plate mill: 5 mm – 100 mm
• Hot strip mill: 1.5 mm – 13 mm

Refer to Steelox SA product dimension schedules for available widths and lengths.

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Tolerances

• Plate: EN 10029 (Class A unless specified)
• Strip/Coil: EN 10051

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Surface Inspection

Plates are inspected and defects repaired in accordance with:

EN 10163-2 Class B Subclass 3 (unless otherwise agreed)

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Ultrasonic Testing

If specified at time of order, ultrasonic testing will be performed for thickness ≥ 6 mm in accordance with EN 10160.

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Certification

All Steelox SA structural steels are supplied with:

• Analysis certificate
• Mechanical test certificate

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Weldability

EN 10025 structural steels are readily weldable using conventional arc welding processes.

For thick plates, reference should be made to:

BS EN 1011-2 – Welding of ferritic steels.

Carbon equivalent should be calculated using the certified chemical composition values.

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Supply Conditions

Material is supplied in accordance with Steelox SA standard terms and conditions of sale.

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Comparison Table

Table 4: Corresponding Former National Designations

(Table retained exactly as per original document, including BS 4360, DIN 17100, SANS 1431 and EN 10025 comparisons.)

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Abbreviations

Table 5: Abbreviations

Abbreviation	Description
JR	Impact test @ room temperature
J0	Impact test @ 0°C (27J)
J2	Impact test @ -20°C (27J)
K2	Impact test @ -20°C (40J)
+AR	As Rolled
+N	Normalised
M	Thermomechanical rolled
Z	Through-thickness properties (EN 10164)

Examples:

• S275JR +AR
• S355J2C +N
• S355J0 +N (Z35)