DIN 17102 StE355|StE 355,StE355 steel plate

 

 

DIN 17102 StE355 | StE 355 Steel Plate | StE355 Normalized Structural Steel Manufacturer & Exporter – Gangsteel

Gangsteel is a specialized manufacturer, stockist, and global exporter of DIN 17102 StE355 steel plates (also written as StE 355 or STE355). This grade is a normalized, fine-grain, weldable structural steel specified under the German standard DIN 17102 (now largely replaced by EN 10025-3 but still actively used in many legacy projects, pressure vessel approvals, bridge construction, offshore structures, and heavy engineering worldwide).

StE355 is a high-strength, low-alloy (HSLA) normalized steel with guaranteed minimum yield strength of 355 MPa (for t ≤ 16 mm) and excellent notch toughness at -50 °C (Charpy V-notch average 27 J), making it suitable for low-temperature service, welded structures, and applications requiring good weldability and impact properties.

Gangsteel keeps large ex-stock of StE355 steel plates in thicknesses 6 mm – 200 mm, widths 1500–4020 mm, and lengths up to 18000 mm. We offer plasma/laser/oxy-fuel cutting, beveling (single/double V, J, K), shot blasting SA 2.5 + zinc-rich primer, bending/rolling, third-party inspection (TÜV, SGS, BV, LR, DNV, ABS), and full EN 10204 3.1 / 3.2 certification.

 

Chemical Composition of DIN 17102 StE355 (Ladle Analysis, max %)

Element	Maximum %	Notes
Carbon (C)	0.18	Low C for excellent weldability
Silicon (Si)	0.50	Fine-grain deoxidation
Manganese (Mn)	1.60	Strength & toughness
Phosphorus (P)	0.035	Controlled for toughness
Sulfur (S)	0.030	Controlled for toughness
Niobium (Nb)	0.060	Grain refinement (Al-killed + Nb)
Vanadium (V)	0.10	Grain refinement (if added)
Aluminum (Al)	0.020	Minimum for fine grain
CEV (IIW)	≤0.43	Typical value – excellent weldability

Carbon Equivalent (CEV)is usually controlled well below 0.43 to allow welding without preheating in most thicknesses.

 

Mechanical Properties – DIN 17102 StE355

Room Temperature Tensile Properties (Transverse)

Thickness (mm)	Yield Strength ReH min (MPa)	Tensile Strength Rm (MPa)	Elongation A5 min (%)
≤16	355	490–640	22
>16 ≤40	345	490–640	22
>40 ≤63	335	490–640	21
>63 ≤100	325	490–640	20
>100 ≤150	315	490–640	19

 

Impact Test – Charpy V-notch (Longitudinal)

Grade	Test Temperature	Minimum Average Energy (J)	Minimum Single Value (J)
StE355	-50 °C	27	19

Note: Impact testing is mandatory for StE355. Gangsteel performs full Charpy V-notch testing at -50 °C on each heat and relevant thickness range.

 

Delivery Condition & Options

• +N– Normalized or normalized rolled (standard delivery condition)
• +AR– As-rolled (available on request for some thicknesses)
• Ultrasonic examination (DIN EN 10160 Class S0/S1 or SEL 072-77 Class 3/4)
• Through-thickness property (Z15 / Z25 / Z35) on request
• Simulated post-weld heat treatment (PWHT) testing available
• Shot blasting SA 2.5 + zinc-rich epoxy primer (optional)
• Low-hydrogen welding consumables recommended

 

Equivalent Grades Table

Standard / Country	Equivalent Grade	Impact Test	Notes
EN 10025-3 Europe	S355NL	-50 °C	Direct modern replacement
EN 10025-3 Europe	S355ML (TMCP)	-50 °C	Thermo-mechanically rolled alternative
GB/T 1591 China	Q345E	-40 °C	Closest Chinese equivalent (impact -40 °C)
ASTM / ASME USA	A633 Gr. E	-50 °C	Similar chemistry & toughness
JIS G3106 Japan	SM490YB / SM520C	-5 °C	Similar strength, weaker impact
API 2H / 2W	API 2H Gr.50 / 2W Gr.50	-40 °C / -60 °C	Offshore structural equivalent

Key Insight: Today, most new projects specify EN 10025-3 S355NL instead of DIN 17102 StE355 — same -50 °C impact requirement and similar chemistry.

Typical Applications of DIN 17102 StE355 Steel Plate

• Offshore platforms, wind tower foundations, and monopiles
• Shipbuilding (ice-class hull structural parts in cold regions)
• Low-temperature pressure vessels & cryogenic storage tanks
• Bridges, crane booms, and heavy machinery in cold climates
• Mining equipment frames and dump truck bodies
• Arctic-grade construction & infrastructure projects
• Oil & gas modules, process skids, and low-temp piping supports

Advantages of Choosing StE355 from Gangsteel

• Guaranteed -50 °C impact toughness (27 J average)
• Excellent weldability (low CEV, no preheat needed for most thicknesses)
• Wide plate dimensions (up to 4200 mm width × 500 mm thick)
• Full traceability, 3.1/3.2 certification, and third-party witness
• Large stock of common thicknesses & fast project delivery
• In-house cutting, beveling, rolling, shot blasting & priming
• Competitive pricing for offshore, shipbuilding & low-temp projects

Quality Assurance & Testing at Gangsteel

• Chemical analysis (ladle & product)
• Tensile, bend, and flattening tests
• Charpy V-notch impact tests at -50 °C
• Ultrasonic examination (EN 10160 / SEL 072-77)
• Surface inspection & dimensional control
• Optional: HIC / SSC testing, through-thickness Z35, simulated PWHT

 

FAQ – DIN 17102 StE355 Steel Plate

Q1: Is DIN 17102 StE355 still a valid specification in 2025?

A: Yes — many older offshore platforms, shipbuilding contracts, bridge projects, and client specifications still call for StE355. The current European replacement is EN 10025-3 S355NL (identical -50 °C impact requirement).

Q2: What is the difference between StE355 and StE355N?

A: StE355 is normalized; StE355N indicates normalized with additional quality requirements (often the same grade). In practice, most plates are delivered +N (normalized).

Q3: Can StE355 be used for offshore structures?

A: Yes, it was widely used in older North Sea and Arctic projects (similar to API 2H Gr.50 or EN S355NL). For new builds, EN 10025-3 S355NL or API 2W Gr.50 is usually specified.

Q4: Does Gangsteel stock DIN 17102 StE355 plates?

A: Yes — common thicknesses 8 mm, 10 mm, 12 mm, 15 mm, 20 mm, 25 mm, 30 mm, 40 mm, 50 mm, 60 mm, 80 mm, 100 mm are usually available ex-stock. Wider/thicker plates can be rolled to order (up to 4200 mm × 500 mm).

Q5: What welding precautions are needed for StE355?

A: Low-hydrogen consumables, preheat 50–100 °C for thickness >40 mm, interpass temperature control. CEV is low, so many thicknesses can be welded without preheating.

Q6: Can you supply StE355 with 3.2 certification?

A: Yes — we regularly supply with third-party certification from Lloyd’s Register, DNV, ABS, BV, SGS, TUV, etc.

Keywords: DIN 17102 StE355, StE355 steel plate, StE 355 steel, 43EE equivalent, S355NL steel plate, low temperature structural steel, -50°C impact steel, offshore steel plate, high toughness steel plate, Gangsteel StE355

Contact Gangsteel today for current stock list, ex-mill prices, cutting schedule, or custom rolling of DIN 17102 StE355 steel plates. We support urgent offshore, shipbuilding, bridge, and low-temperature projects worldwide.