High-Quality EN 10120 P245NB (1.0111) Pressure Vessel Steel Plate

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P245NB (Material Number 1.0111) is a non-alloy, weldable quality steel definedunder EN 10120, specifically designed for manufacturing welded gas cylinders andpressure vessels, commonly used in thicknesses up to Smm. It features a minimum yield strength of 255MPa.

 

The designation "P245NB" breaks down as follows:
• P: Pressure purposes.
• 245: Minimum yield strength of 245 MPa.
• N: Normalized (or formed by normalizing rolling).
• B: Specified for gas cylinders (in certain standards) or simply a grade variant.

 

 

The chemical composition ensures good weldability and ductility while maintaining strength at elevated temperatures.

 

Element	Percentage (Max/Range)
Carbon (C)	0.16% max
Silicon (Si)	0.40% max
Manganese (Mn)	0.50% – 1.20%
Phosphorus (P)	0.025% max
Sulfur (S)	0.015% max
Chromium (Cr)	0.30% max
Nickel (Ni)	0.30% max
Molybdenum (Mo)	0.08% max
Aluminum (Al)	0.020% min
Copper (Cu)	0.30% max

Low carbon, low phosphorus and sulfur, and micro-alloying (Nb/Ti/Al for grain refinement) ensure high plasticity, high toughness, and excellent weldability.

 

 

At room temperature, P245NB exhibits the following characteristics:

Property	Value
Yield Strength (Re​)	≥245 MPa
Tensile Strength (Rm)	390 – 530 MPa
Elongation (A5)	≥23%
Impact Energy (KV)	27 J (at -20°C) or 40 J (at 0°C)

The yield strength decreases as the operating temperature increases (a critical factor for boiler and pressure vessel design).

 

 

P245NB is the European designation. Depending on the country or the specific application (tubes vs. plates), its equivalents are:

Standard	Equivalent Grade
ASTM/ASME (USA)	ASTM A106 Grade B / A516 Grade 60
DIN (Germany)	St 41.8 / DIN 17175
JIS (Japan)	STPG 370 / SG 255
GB (China)	20G / Q245R
AFNOR (France)	TU 42 C
UNI (Italy)	C20

 

 

P245NB Production Flow

 

Raw Material Preparation & Hot Metal Desulfurization

High-quality hot metal is processed to reduce sulfur content, ensuring low impurity levels for gas cylinder applications.

 

Converter / Electric Arc Furnace Smelting

Strictly controlled low-carbon smelting to meet chemical composition requirements of P245NB (1.0111). Low phosphorus and sulfur are maintained for excellent toughness and weldability.

 

LF Refining & Clean Steel Production

Deep deoxidation with aluminum, fine grain treatment with microalloying elements (Nb, Ti). Inclusions are effectively modified to improve formability and non-aging performance.

 

Continuous Casting

Protected casting technology is adopted to avoid reoxidation. Slabs are produced with uniform structure and stable internal quality.

 

Controlled Hot Rolling

Slabs are heated and rolled under precise temperature control. Fine ferrite-pearlite structure is obtained through TMCP technology, ensuring balanced strength and ductility.

 

Normalizing Heat Treatment (+N)

Normalizing at approximately 880–920℃ is the key process for P245NB. It stabilizes mechanical properties, eliminates aging tendency, and improves welding performance.

 

Finishing & Quality Inspection

Descaling, straightening, cutting, ultrasonic testing (UT), surface inspection and dimensional inspection are carried out to ensure compliance with EN 10120 standard.

 

Packing & DeliveryProducts are packed in strict accordance with export requirements, suitable for long-distance transportation.

 

 

Key Quality Control Points

• Strictly controlled chemical composition: low carbon, low sulfur, low phosphorus.
• Microalloying treatment for fine grain and non-aging performance.
• Normalized delivery condition to guarantee stable mechanical properties.
• Full UT inspection to ensure no internal defects.
• High formability and excellent weldability for welded gas cylinders.

 

    

 

 

Excellent Cold Formability
As a low-carbon, fine-grained steel of a lower strength grade within the EN10120 standard, P245NB is fundamentally designed to emphasize high ductility and exceptional cold-forming capabilities. Through strict control of carbon content and alloy composition-combined with a delivery condition of normalizing or controlled rolling followed by normalizing-this steel grade exhibits a remarkably high elongation at break.

 

Consequently, it facilitates the smooth execution of various cold-forming processes-such as deep drawing, roll forming, bending, and spin forming-at room temperature, making it ideally suited for the integral forming of gas cylinder shells.

 

When manufacturing thin-walled gas cylinders or small-scale gas storage vessels, the material is highly resistant to defects such as cracking, wrinkling, or excessive springback; it maintains dimensional stability during forming, thereby significantly reducing the scrap rate in production. Compatible with automated continuous forming lines, it stands as the ideal material for the forming of low-pressure welded gas cylinder shells.

 

 

Excellent Weldability
P245NB features a low-carbon design with a low carbon equivalent, fundamentally guaranteeing superior welding performance that fully meets the manufacturing requirements for welded gas cylinders. During the welding process, the material exhibits low sensitivity to heat input; the microstructure within the Heat-Affected Zone (HAZ) remains uniform with minimal hardness variation, showing little tendency toward the formation of hardened structures or cold cracks.

 

Consequently, reliable welded joints can be achieved without the need for complex preheating or post-weld heat treatments. Furthermore, the material boasts high purity, with strict controls in place for harmful elements such as phosphorus and sulfur. This ensures that both the weld seam and the HAZ retain excellent toughness, while the strength of the welded joint closely matches that of the base metal.

 

This high structural integrity minimizes the risk of failure during long-term pressurized service, making the material compatible with mainstream gas cylinder welding processes, such as resistance welding and arc welding.

 

 

Fine-Grained Toughness
Through the addition of micro-alloying elements-such as aluminum, niobium, and titanium-combined with controlled rolling and normalizing processes, P245NB achieves a stable, fine-grained microstructure.

 

This structure significantly enhances the material's low-temperature toughness and impact resistance. The fine-grained structure effectively inhibits the initiation and propagation of cracks, allowing the material to maintain excellent ductility and toughness even in low-temperature environments or under instantaneous impact loads.

 

This effectively mitigates the risk of brittle fracture, thereby fully complying with the safety and toughness requirements stipulated by the EN10120 standard for steels used in welded gas cylinders.

 

This characteristic ensures enhanced safety for gas cylinders during storage, transport, use, and minor impacts; it is particularly well-suited for gas storage vessels subject to rigorous standards regarding low-temperature toughness and structural reliability.

 

 

Pressure Vessels: Construction of tanks and boilers that hold gases or liquids under pressure.

Gas Cylinders: Specifically used for seamless gas cylinders.

Oil and Gas: Pipelines for transporting hot fluids.

Power Generation: Heat exchanger tubes and steam headers.

Chemical Industry: Components for processing plants operating at moderate temperatures.

 

 

Common Applications of P245NB steel

 

 

Item	P245NB(1.0111)	P265NB(1.0423)	P310NB(1.0437)	P355NB(1.0557)
Standard	EN 10120	EN 10120	EN 10120	EN 10120
Meaning of Grade	P=Pressure245=Min yield 245MPaN=NormalizedB=Fine grain	P=Pressure265=Min yield 265MPaN=NormalizedB=Fine grain	P=Pressure310=Min yield 310MPaN=NormalizedB=Fine grain	P=Pressure355=Min yield 355MPaN=NormalizedB=Fine grain
Yield Strength	≥ 245 MPa	≥ 265 MPa	≥ 310 MPa	≥ 355 MPa
Tensile Strength	360 – 450 MPa	370 – 480 MPa	410 – 530 MPa	470 – 600 MPa
Elongation (A₅)	Highest≥26%~34%	High≥24%~32%	Medium≥22%~30%	Relatively low≥20%~28%
Strength Level	Lowest strength	Medium strength(General purpose)	Medium‑high strength	High strength
Formability	Excellent	Very good	Good	Fair
Typical Application	Light-duty & low-pressure gas cylinders	Most widely usedgeneral gas cylinders	Medium-pressure cylinders & vessels	High-pressure gas cylinders
Material Type	Pressure vessel steel for welded gas cylinders	Pressure vessel steel for welded gas cylinders	Pressure vessel steel for welded gas cylinders	Pressure vessel steel for welded gas cylinders

 

 

• Technical Consultation: We provide one-stop technical services including material selection, structural design, and process optimization.

 

• Fast Delivery: Sufficient stock of standard specifications allows for fast delivery within 15 days; delivery dates for customized specifications are determined based on production schedules.

 

• Quality Assurance: We offer a 1-year warranty, covering free replacement for damage caused by material quality issues within the warranty period.

 

• After-Sales Support: We regularly follow up with customers, collect user feedback, and continuously optimize product performance and service experience.

 

    

As a direct mill-linked supplier, GNEE can provide high-quality, traceable production and reliable delivery.

 

 

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What is P245NB steel grade?

 

P245NB is a low-carbon fine-grain steel specifically designed for welded gas cylinders, compliant with the European EN 10120 standard. It is a pressure vessel grade with excellent cold formability, weldability and fine-grain toughness, widely used in the manufacture of low-pressure gas storage containers.

What standard does P245NB comply with?

 

P245NB strictly complies with the EN 10120 standard, which is the European standard for "Steel sheet and strip for welded gas cylinders". This standard specifies the chemical composition, mechanical properties, delivery conditions and quality requirements of steel used for welded gas cylinders.

 

What is the material number (W.Nr.) of P245NB?

 

The material number (Werkstoffnummer) of P245NB is 1.0111, which is the German standard number used to uniquely identify this steel grade in industrial applications.

 

What does "P245NB" stand for in EN 10120?

 

Each letter and number in P245NB has a specific meaning: "P" stands for Pressure (pressure application), "245" represents the minimum yield strength of 245 MPa, "N" means Normalized (normalized or normalized rolling), and "B" indicates Fine grain (fine-grain structure to ensure welding toughness).

 

Is P245NB a pressure vessel steel?

 

Yes, P245NB is a pressure vessel steel. It is specially developed for the manufacture of welded gas cylinders and low-pressure vessels, and its mechanical properties and quality requirements fully meet the safety standards for pressure-bearing equipment.

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