Introduction

Steel Profile (Structural Steel Section) is a steel product that has been rolled, drawn or pressed into a shape of consistent cross-section over its entire length. Unlike general steel plates or bars, steel profiles feature precisely engineered cross-sectional geometries that maximize structural efficiency – delivering superior strength-to-weight ratios for load-bearing applications.

Compared with conventional flat steel products, steel profiles offer optimized moment of inertia and section modulus, enabling them to withstand complex bending, torsion and compression loads with minimal material usage. Their standardized shapes ensure consistent mechanical performance, dimensional accuracy and easy installation in construction and engineering projects.

We offer a comprehensive range of steel profiles including H beams, I beams, U channels, equal and unequal angle steels, T profiles, Z profiles, flat bars and custom special profiles. Available in carbon steel, stainless steel and high-strength alloy grades, with heights from 20 mm to 900 mm, web thicknesses from 2 mm to 15 mm, and customizable lengths from 4 m to 18 m. Multiple surface finishes are offered including as-rolled, pickled, ground, polished and hot-dip galvanized.

Product Type	Executive Standard	Dimension Range	Steel Grade
Hot Rolled H Beam	ASTM A6, EN 10025, JIS G3192	Height: 100–900 mm; Flange: 100–300 mm	Q235B, Q345B, S235JR, S355JR, SS400
Hot Rolled I Beam	ASTM A6, EN 10025	Height: 80–600 mm	S235JR, S275JR, S355JR
U Channel	EN 10279, ASTM A6	Height: 20–400 mm; Flange: 20–150 mm	S235JR, S355J2, Q235B
Equal Angle Steel	ISO 657-1, EN 10056	Leg: 20–200 mm; Thickness: 2–20 mm	S235JR, S355JR, Q235B, Q345B
Unequal Angle Steel	ISO 657-2, EN 10056	Leg: 20×30–100×200 mm	S235JR, S355JR
T Profile	EN 10055	Leg: 20–120 mm; Thickness: 3–15 mm	S235JR, S355JR, 304, 316L
Z Profile	Customer specification	Leg: 20–100 mm; Thickness: 2–8 mm	S235JR, S355JR, 304, 316L
Stainless Steel Profiles	ASTM A276, EN 10088-3	Custom dimensions	304, 304L, 316L, 321, 310S
High-Strength Steel Profiles	EN 10025, EN 10149	Custom dimensions	S460M, S550QL, S690Q, S690QL

Standard & Tolerances

All steel profiles are manufactured in strict compliance with international standards including ASTM A6/A6M, EN 10025, EN 10088-3 and EN 10279. Dimensional tolerances are controlled according to EN 10279 for U channels and EN 10034 for structural steel sections, ensuring precise fit and high surface quality.

Dimensional Tolerances (Reference – EN 10279 / EN 10034):

Parameter	Permissible Variation
Height (h)	± 2.0 mm (for h ≤ 200 mm); ± 3.0 mm (for h > 200 mm)
Flange Width (b)	± 2.0 mm (for b ≤ 100 mm); ± 3.0 mm (for b > 100 mm)
Web Thickness (t)	± 0.5 mm (for t ≤ 5 mm); ± 10% (for t > 5 mm)
Flange Thickness (t)	± 0.5 mm (for t ≤ 5 mm); ± 10% (for t > 5 mm)
Straightness	≤ 0.3% of total length
Twist	≤ 0.25% of total length

Custom tolerances available upon request for precision engineering applications.

Material Properties

Below are standard technical references for steel profiles, covering chemical composition and mechanical properties. All data complies with ASTM and EN standards for each steel grade.

Chemical composition defines element content ranges to guarantee weldability, formability and structural integrity. Mechanical properties show standardized strength and elongation values, ensuring reliable performance in load-bearing and dynamic applications. All technical indicators are traceable and support third-party inspection for high-standard industrial applications.

Chemical Requirements (%) – Carbon Steel Grades

Grade	C	Si	Mn	P	S	Cr	Ni	Cu
S235JR	≤0.20	≤0.55	≤1.60	≤0.045	≤0.045	—	—	—
S275JR	≤0.21	≤0.55	≤1.60	≤0.045	≤0.045	—	—	—
S355JR	≤0.24	≤0.55	≤1.60	≤0.045	≤0.045	—	—	—
Q235B	≤0.22	≤0.35	≤1.40	≤0.045	≤0.045	—	—	—
Q345B	≤0.20	≤0.55	≤1.70	≤0.040	≤0.040	—	—	—
Q355B	≤0.24	≤0.55	≤1.60	≤0.035	≤0.035	≤0.30	≤0.30	≤0.40

Chemical Requirements (%) – Stainless Steel Grades

Grade	UNS Designation	C	Mn	P	S	Si	Cr	Ni	Mo	Other
304	S30400	≤0.08	≤2.00	≤0.045	≤0.030	≤1.00	18.0–20.0	8.0–11.0	—	—
304L	S30403	≤0.035	≤2.00	≤0.045	≤0.030	≤1.00	18.0–20.0	8.0–13.0	—	—
316L	S31603	≤0.035	≤2.00	≤0.045	≤0.030	≤1.00	16.0–18.0	10.0–14.0	2.00–3.00	—
321	S32100	≤0.08	≤2.00	≤0.045	≤0.030	≤1.00	17.0–19.0	9.0–12.0	—	Ti ≥ 5×(C+N)

Mechanical Properties – Carbon Steel Grades

Grade	Tensile Strength, min (MPa)	Yield Strength, min (MPa)	Elongation, min (%)
S235JR	360–510	235	24
S275JR	410–560	275	22
S355JR	470–630	355	20
Q235B	370–500	235	26
Q345B	470–630	345	21
Q355B	470–630	355	20

Mechanical Properties – Stainless Steel Grades

Grade	Tensile Strength, min (MPa)	Yield Strength, min (MPa)	Elongation, min (%)
304	515	205	40
304L	485	170	40
316L	485	170	40
321	515	205	40
310S	515	205	40

Process & Finishing

Steel profiles are primarily manufactured by two core methods: hot rolling and cold drawing. Hot rolling involves heating steel billets to approximately 1100°C and continuously forming them through multiple rolling passes. This process is ideal for large structural profiles and offers excellent production efficiency. Cold drawing is performed at ambient temperatures, producing profiles with tight tolerances (h9), excellent surface finish and the capability to manufacture small lots.

Our complete standardized production process includes:

1. Raw Material Preparation – Premium steel billets or wire rods are selected and preheated to ensure stable forming quality.

2. Hot Rolling Forming – Heated billets undergo multi-pass rolling on professional mills. Progressive deformation guarantees uniform cross-section, precise dimensional tolerance and optimal mechanical properties.

3. Cold Drawing (Optional) – For high-precision profiles, cold drawing is applied at room temperature to improve dimensional accuracy, straightness and surface finish.

4. Heat Treatment & Straightening – Hot-rolled or cold-drawn profiles undergo annealing or normalizing to optimize internal microstructure and relieve residual stresses. Straightening ensures precise linearity.

5. Surface Treatment – Integrated pickling removes rolling scale and oxide layers. Passivation creates a uniform protective surface and enhances corrosion resistance. Mechanical polishing achieves mirror-grade smooth finish. Hot-dip galvanizing provides superior anti-corrosion protection for outdoor applications.

6. Quality Inspection & Packaging – Finished profiles undergo strict dimensional inspection, NDT flaw detection and mechanical testing. Only fully qualified products are packaged and delivered to ensure stable and reliable performance.

Test & QC

All steel profiles are manufactured in strict accordance with official industry standards and undergo comprehensive systematic testing before shipment, ensuring zero potential defects and complete structural integrity for construction and engineering use.

Tensile Testing is implemented as a mandatory inspection procedure, verifying that each finished profile meets specified strength and elongation requirements.

Chemical Composition Analysis ensures material purity and compliance with standard specifications.

Dimensional Inspection verifies height, flange width, web thickness, straightness and twist against tolerance requirements.

Non-Destructive Testing (NDT) – Optional ultrasonic testing (UT) identifies internal defects such as laminations, inclusions and porosity; magnetic particle inspection (MPI) detects surface and near-surface defects; dye penetrant inspection (DPI) reveals surface cracks and porosity; radiographic testing (RT) generates internal structure images to assess quality.

After passing all quality tests, profiles undergo customized finishing and standardized packaging. Available processing includes precision straightening, custom fixed-length cutting and professional surface polishing. Each product is clearly stenciled with complete batch and manufacturing information, realizing full lot traceability.

FAQ

Q1: Why are steel profiles preferred over flat steel plates in structural applications?

Steel profiles feature engineered cross-sectional geometries (H, I, U, L, T shapes) that provide optimized moment of inertia and section modulus. This enables them to withstand complex bending, torsion and compression loads with significantly less material than flat plates, resulting in lighter structures, lower material costs and easier installation.

Q2: What is the difference between hot-rolled and cold-drawn steel profiles?

Hot rolling is performed at approximately 1100°C and is ideal for large structural profiles with high production efficiency. Cold drawing is performed at ambient temperatures and produces profiles with tighter tolerances (h9), superior surface finish and the ability to manufacture small lots. Cold-drawn profiles also offer higher strength, improved dimensional accuracy and better straightness.

Q3: Which steel grade should I choose for my project?

For general structural applications, S235JR or Q235B provides good strength and weldability. For higher load-bearing requirements, S355JR or Q345B offers superior strength. For corrosive environments, stainless steel grades 304 or 316L are recommended. For extreme high-strength requirements, S460M, S550QL or S690Q are available.

Q4: What surface treatments are available for steel profiles?

We offer multiple surface finishes including as-rolled (black), pickled matte, bright drawn, ground, polished and hot-dip galvanized. Pickling removes rolling scale and oxide layers; passivation enhances corrosion resistance; hot-dip galvanizing provides superior protection for outdoor and marine applications.

Q5: How do steel profiles perform in corrosive environments?

Carbon steel profiles require protective coatings such as hot-dip galvanizing or zinc spraying for corrosion resistance in outdoor or moist environments. Stainless steel profiles (304, 316L) offer inherent corrosion resistance and are suitable for chemical, marine and food processing applications.

Q6: Can steel profiles be customized to specific dimensions?

Yes. We offer custom profile production with tailored dimensions, including special non-standard shapes. Standard lengths are 6,000 mm, with customized lengths available upon request. Minimum order quantities are flexible for stainless steel profiles.

Q7: What quality certifications do your steel profiles carry?

Our steel profiles are manufactured in compliance with ASTM A6/A6M, EN 10025, EN 10088-3 and EN 10279 standards. Full third-party inspection certification reports can be provided upon request.

Q8: In which applications are steel profiles irreplaceable?

Steel profiles are irreplaceable in load-bearing building structures, bridges and building facades; machine frames and mechanical engineering components; automotive frames and suspension systems; underground mine and tunnel supports; and industrial warehouse, commercial and production facility construction. These critical applications demand the unique combination of strength, precision and structural efficiency that only steel profiles can provide.

All steel profiles are manufactured in strict compliance with international standards including ASTM A6/A6M, EN 10025, EN 10088-3 and EN 10279. Dimensional tolerances are controlled according to EN 10279 for U channels and EN 10034 for structural steel sections, ensuring precise fit and high surface quality.

Dimensional Tolerances (Reference – EN 10279 / EN 10034):

Parameter	Permissible Variation
Height (h)	± 2.0 mm (for h ≤ 200 mm); ± 3.0 mm (for h > 200 mm)
Flange Width (b)	± 2.0 mm (for b ≤ 100 mm); ± 3.0 mm (for b > 100 mm)
Web Thickness (t)	± 0.5 mm (for t ≤ 5 mm); ± 10% (for t > 5 mm)
Flange Thickness (t)	± 0.5 mm (for t ≤ 5 mm); ± 10% (for t > 5 mm)
Straightness	≤ 0.3% of total length
Twist	≤ 0.25% of total length

Custom tolerances available upon request for precision engineering applications.

Below are standard technical references for steel profiles, covering chemical composition and mechanical properties. All data complies with ASTM and EN standards for each steel grade.

Chemical composition defines element content ranges to guarantee weldability, formability and structural integrity. Mechanical properties show standardized strength and elongation values, ensuring reliable performance in load-bearing and dynamic applications. All technical indicators are traceable and support third-party inspection for high-standard industrial applications.

Chemical Requirements (%) – Carbon Steel Grades

Grade	C	Si	Mn	P	S	Cr	Ni	Cu
S235JR	≤0.20	≤0.55	≤1.60	≤0.045	≤0.045	—	—	—
S275JR	≤0.21	≤0.55	≤1.60	≤0.045	≤0.045	—	—	—
S355JR	≤0.24	≤0.55	≤1.60	≤0.045	≤0.045	—	—	—
Q235B	≤0.22	≤0.35	≤1.40	≤0.045	≤0.045	—	—	—
Q345B	≤0.20	≤0.55	≤1.70	≤0.040	≤0.040	—	—	—
Q355B	≤0.24	≤0.55	≤1.60	≤0.035	≤0.035	≤0.30	≤0.30	≤0.40

Chemical Requirements (%) – Stainless Steel Grades

Grade	UNS Designation	C	Mn	P	S	Si	Cr	Ni	Mo	Other
304	S30400	≤0.08	≤2.00	≤0.045	≤0.030	≤1.00	18.0–20.0	8.0–11.0	—	—
304L	S30403	≤0.035	≤2.00	≤0.045	≤0.030	≤1.00	18.0–20.0	8.0–13.0	—	—
316L	S31603	≤0.035	≤2.00	≤0.045	≤0.030	≤1.00	16.0–18.0	10.0–14.0	2.00–3.00	—
321	S32100	≤0.08	≤2.00	≤0.045	≤0.030	≤1.00	17.0–19.0	9.0–12.0	—	Ti ≥ 5×(C+N)

Mechanical Properties – Carbon Steel Grades

Grade	Tensile Strength, min (MPa)	Yield Strength, min (MPa)	Elongation, min (%)
S235JR	360–510	235	24
S275JR	410–560	275	22
S355JR	470–630	355	20
Q235B	370–500	235	26
Q345B	470–630	345	21
Q355B	470–630	355	20

Mechanical Properties – Stainless Steel Grades

Grade	Tensile Strength, min (MPa)	Yield Strength, min (MPa)	Elongation, min (%)
304	515	205	40
304L	485	170	40
316L	485	170	40
321	515	205	40
310S	515	205	40

Steel profiles are primarily manufactured by two core methods: hot rolling and cold drawing. Hot rolling involves heating steel billets to approximately 1100°C and continuously forming them through multiple rolling passes. This process is ideal for large structural profiles and offers excellent production efficiency. Cold drawing is performed at ambient temperatures, producing profiles with tight tolerances (h9), excellent surface finish and the capability to manufacture small lots.

Our complete standardized production process includes:

1. Raw Material Preparation – Premium steel billets or wire rods are selected and preheated to ensure stable forming quality.

2. Hot Rolling Forming – Heated billets undergo multi-pass rolling on professional mills. Progressive deformation guarantees uniform cross-section, precise dimensional tolerance and optimal mechanical properties.

3. Cold Drawing (Optional) – For high-precision profiles, cold drawing is applied at room temperature to improve dimensional accuracy, straightness and surface finish.

4. Heat Treatment & Straightening – Hot-rolled or cold-drawn profiles undergo annealing or normalizing to optimize internal microstructure and relieve residual stresses. Straightening ensures precise linearity.

5. Surface Treatment – Integrated pickling removes rolling scale and oxide layers. Passivation creates a uniform protective surface and enhances corrosion resistance. Mechanical polishing achieves mirror-grade smooth finish. Hot-dip galvanizing provides superior anti-corrosion protection for outdoor applications.

6. Quality Inspection & Packaging – Finished profiles undergo strict dimensional inspection, NDT flaw detection and mechanical testing. Only fully qualified products are packaged and delivered to ensure stable and reliable performance.

All steel profiles are manufactured in strict accordance with official industry standards and undergo comprehensive systematic testing before shipment, ensuring zero potential defects and complete structural integrity for construction and engineering use.

Tensile Testing is implemented as a mandatory inspection procedure, verifying that each finished profile meets specified strength and elongation requirements.

Chemical Composition Analysis ensures material purity and compliance with standard specifications.

Dimensional Inspection verifies height, flange width, web thickness, straightness and twist against tolerance requirements.

Non-Destructive Testing (NDT) – Optional ultrasonic testing (UT) identifies internal defects such as laminations, inclusions and porosity; magnetic particle inspection (MPI) detects surface and near-surface defects; dye penetrant inspection (DPI) reveals surface cracks and porosity; radiographic testing (RT) generates internal structure images to assess quality.

After passing all quality tests, profiles undergo customized finishing and standardized packaging. Available processing includes precision straightening, custom fixed-length cutting and professional surface polishing. Each product is clearly stenciled with complete batch and manufacturing information, realizing full lot traceability.

Q1: Why are steel profiles preferred over flat steel plates in structural applications?

Steel profiles feature engineered cross-sectional geometries (H, I, U, L, T shapes) that provide optimized moment of inertia and section modulus. This enables them to withstand complex bending, torsion and compression loads with significantly less material than flat plates, resulting in lighter structures, lower material costs and easier installation.

Q2: What is the difference between hot-rolled and cold-drawn steel profiles?

Hot rolling is performed at approximately 1100°C and is ideal for large structural profiles with high production efficiency. Cold drawing is performed at ambient temperatures and produces profiles with tighter tolerances (h9), superior surface finish and the ability to manufacture small lots. Cold-drawn profiles also offer higher strength, improved dimensional accuracy and better straightness.

Q3: Which steel grade should I choose for my project?

For general structural applications, S235JR or Q235B provides good strength and weldability. For higher load-bearing requirements, S355JR or Q345B offers superior strength. For corrosive environments, stainless steel grades 304 or 316L are recommended. For extreme high-strength requirements, S460M, S550QL or S690Q are available.

Q4: What surface treatments are available for steel profiles?

We offer multiple surface finishes including as-rolled (black), pickled matte, bright drawn, ground, polished and hot-dip galvanized. Pickling removes rolling scale and oxide layers; passivation enhances corrosion resistance; hot-dip galvanizing provides superior protection for outdoor and marine applications.

Q5: How do steel profiles perform in corrosive environments?

Carbon steel profiles require protective coatings such as hot-dip galvanizing or zinc spraying for corrosion resistance in outdoor or moist environments. Stainless steel profiles (304, 316L) offer inherent corrosion resistance and are suitable for chemical, marine and food processing applications.

Q6: Can steel profiles be customized to specific dimensions?

Yes. We offer custom profile production with tailored dimensions, including special non-standard shapes. Standard lengths are 6,000 mm, with customized lengths available upon request. Minimum order quantities are flexible for stainless steel profiles.

Q7: What quality certifications do your steel profiles carry?

Our steel profiles are manufactured in compliance with ASTM A6/A6M, EN 10025, EN 10088-3 and EN 10279 standards. Full third-party inspection certification reports can be provided upon request.

Q8: In which applications are steel profiles irreplaceable?

Steel profiles are irreplaceable in load-bearing building structures, bridges and building facades; machine frames and mechanical engineering components; automotive frames and suspension systems; underground mine and tunnel supports; and industrial warehouse, commercial and production facility construction. These critical applications demand the unique combination of strength, precision and structural efficiency that only steel profiles can provide.

Keywords	Structural Steel Profile, Hot Rolled Steel Profile, Cold Drawn Steel Profile, H Beam, I Beam, U Channel, Angle Steel, T Profile
Size	Height Range: 20 mm – 900 mm; Flange Width: 20 mm – 300 mm
Size	Web Thickness: 2 mm – 15 mm; Length: Standard 6,000 mm; customized lengths available upon request
Standards & Materials	ASTM A6/A6M,ASTM A276,ASTM A1043/A1043M,EN 10025,EN 10088-3,EN 10279,DIN 17100,ISO 657
	Carbon Steel Grades:S235JR, S235J0, S235J2, S275JR, S275J0, S275J2, S355JR, S355J0, S355J2, S355K2,Q235B, Q345B, Q355B, SS400
	Stainless Steel Grades:304 (1.4301), 304L, 316L (1.4404), 321, 310S
	High-Strength Steel Grades:S460M, S550QL, S690Q, S690QL
Application	Load-bearing structures, bridges and building facades; machine frames, guides and mechanical components; vehicle frames, suspension systems and automotive structural components

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Introduction

Standard & Tolerances

Material Properties

Process & Finishing

Test & QC

FAQ

Q1: Why are steel profiles preferred over flat steel plates in structural applications?

Q2: What is the difference between hot-rolled and cold-drawn steel profiles?

Q3: Which steel grade should I choose for my project?

Q4: What surface treatments are available for steel profiles?

Q5: How do steel profiles perform in corrosive environments?

Q6: Can steel profiles be customized to specific dimensions?

Q7: What quality certifications do your steel profiles carry?

Q8: In which applications are steel profiles irreplaceable?

Q1: Why are steel profiles preferred over flat steel plates in structural applications?

Q2: What is the difference between hot-rolled and cold-drawn steel profiles?

Q3: Which steel grade should I choose for my project?

Q4: What surface treatments are available for steel profiles?

Q5: How do steel profiles perform in corrosive environments?

Q6: Can steel profiles be customized to specific dimensions?

Q7: What quality certifications do your steel profiles carry?

Q8: In which applications are steel profiles irreplaceable?

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