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EN 10219 STEEL PIPE

EN 10219 is a European standard that specifies requirements for cold-formed welded structural hollow sections made from non-alloy and fine-grain steels without heat treatment. These sections are used in construction, civil engineering, and for the transportation of fluids in various industries.

Chemical Composition

Structural hollow sections of non-alloy steels Chemical composition,max,%
	C	Si	Mn	P	S	N
S235JRH	0.17	-	1.4	0.045	0.045	0.009
S275J0H	0.2	-	1.5	0.04	0.04	0.009
S275J2H	0.2	-	1.5	0.035	0.035	-
S355J0H	0.22	0.55	1.6	0.04	0.04	0.009
S355J2H	0.22	0.55	1.6	0.035	0.035	-

Structural hollow sections of fine grain steels Chemical composition,max,%,feedstock condition N(Normalized/Normalized Rolled)
	C	Si	Mn	P	S	Nb	V	Al _{(total min)}	Ti	Cr	Ni	Mo	Cu	N
S275NH	0.2	0.4	0.5 - 1.4	0.035	0.03	0.05	0.05	0.02	0.03	0.3	0.3	0.1	0.35	0.015
S275NLH	0.2	0.4	0.5 - 1.4	0.03	0.025	0.05	0.05	0.02	0.03	0.3	0.3	0.1	0.35	0.015
S355NH	0.2	0.5	0.9 - 1.65	0.035	0.03	0.05	0.12	0.02	0.03	0.3	0.5	0.1	0.35	0.015
S355NLH	0.18	0.5	0.9 - 1.65	0.03	0.025	0.05	0.12	0.02	0.03	0.3	0.5	0.1	0.35	0.015

The chemical composition of these steel grades includes elements such as Carbon (C), Silicon (Si), Manganese (Mn), Phosphorus (P), Sulfur (S), and Nitrogen (N). Here's a summary of their significance:

Carbon (C): Increases strength and hardness but can reduce ductility.
Silicon (Si): Aids in deoxidation and can improve strength.
Manganese (Mn): Enhances strength and hardness.
Phosphorus (P) and Sulfur (S): Generally undesirable as they can reduce ductility and toughness, but their content is limited in these steel grades.
Nitrogen (N): Can improve strength but is controlled to avoid embrittlement.
Trace amounts of alloying elements such as Vanadium (V), Titanium (Ti), and Niobium (Nb) may also be present to refine the grain and improve steel performance.

the differences between the steel grades J0H, J2H, JRH, NH, and NLH

Q:1.what is J0H?

A:This designation indicates that the steel has been tested for impact toughness at 0°C and must meet a minimum impact energy requirement of 27 Joules. The "J0" specifies the temperature at which the impact test is conducted, and "H" denotes that it is a hollow section.

Q:2.what is J2H?

A:Similar to J0H, but the "J2" indicates that the steel has been tested for impact toughness at -20°C and must meet a minimum impact energy requirement of 27 Joules. This makes J2H steel more suitable for use in colder environments where materials may become brittle.

Q:3.what is JRH?

A:The "JR" indicates that the steel has specified impact properties at room temperature, with a minimum impact energy requirement of 27 Joules. This is typically used for steel grades that do not require testing at lower temperatures.

Q:4.what is NH?

A:The "N" in this designation signifies that the steel is normalized or normalized rolling, which results in fine-grain steel. This process improves the steel's toughness, especially at lower temperatures. The "H" again indicates that it is a hollow section, and the steel must meet a minimum impact energy requirement of 40 Joules at -20°C.Q:4.what is NH?

Q:5.what is NLH?

A:Similar to NH, but with the "L" indicating that the steel has been tested for impact toughness at -50°C and must meet a minimum impact energy requirement of 27 Joules. This makes NLH steel suitable for extremely cold environments.

The differences between these steel grades lie in the specific temperatures at which they are tested for impact toughness and their minimum impact energy requirements. J0H and J2H are designed for use at 0°C and -20°C respectively, while JRH is for room temperature applications. NH and NLH are fine-grain steels with enhanced toughness, tested at -20°C and -50°C respectively, making them suitable for use in colder climates.

Mechanical properties

Mechanical properties of non-alloy steel hollow sections
Steel designation	Yield strength, min,psi [MPa]		Tensle strength, min,psi[MPa]		Elongation,min,%
	Nominal thickness		Nominal thickness		Nominal thickness
	≤ 16	> 16 ≤ 40	＜3	≥3≤40	≤ 40
S235JRH	235	225	360-510	340-470	24
S275J0H	275	265	430-580	410-560	20
S275J2H	275	265	430-580	410-560	20
S355J0H	355	345	510-680	490-630	20
S355J2H	355	345	510-680	490-630	20

Mechanical properties of fine grain steels hollow sections, feedstock condition N(Normalized/Normalized Rolled)
Steel designation	Yield Strength, min,psi [MPa]		Tensle strength, min,psi[MPa]	Elongation,min,%
	Nominal thickness		Nominal thickness	Nominal thickness
	≤ 16	> 16 ≤ 40	≤40	≤ 40
S275NH	275	265	370-540	24
S275NLH	275	265	370-540	24
S355NH	355	345	470-630	22
S355NLH	355	345	470-630	22

Yield Strength: Indicates the minimum stress that can be applied to the steel before it begins to deform plastically.

Tensile Strength: The maximum stress that the steel can withstand before breaking.

Elongation: Measures the ductility of the steel, or its ability to deform under stress before fracturing.

Impact Energy: A measure of the steel's toughness, especially at lower temperatures, which is critical for structures exposed to cold environments.

Strength: The S355 grades have the highest yield and tensile strengths, making them suitable for heavy-load-bearing structures. The S275 grades offer a balance between strength and ductility, while the S235JRH is the least strong but most ductile among them.
Ductility: The S235JRH has the highest elongation, indicating greater ductility compared to the other grades, which have a minimum elongation of 20%.

CLICK HERE➡The Difference Between EN10210 And EN10219

Comparison

S235JRH: The least strong but most ductile, suitable for general structural applications where high strength is not critical.
S275 Grades (J0H & J2H): Offer a balance between strength and ductility, with S275J2H being more suitable for low-temperature applications due to its improved impact toughness.
S355 Grades (J0H & J2H): High-strength steels for heavy-load-bearing structures, with S355J2H being more suitable for colder environments.
NH and NLH Grades: Fine-grain steels with enhanced toughness, tested at -20°C and -50°C respectively, making them suitable for use in cold climates.

Applications

EN 10219 steel grades are widely used in:

Construction:

Buildings, bridges, and towers, especially in the form of hollow sections like CHS, SHS, and RHS.

Machinery:

Machinery manufacturing where high strength and durability are required.

Infrastructure:

Oil and gas pipelines, water and electricity facilities, and environmental protection structures.

These steel grades offer a range of properties that make them suitable for a variety of applications, with the choice often depending on the specific requirements for strength, toughness, and temperature resistance.