HW · HM · HN · h 100–600 · Q235B / Q355B · GB/T 11263
Wide-flange H-beam
Hot-rolled H-section with parallel flange faces to GB/T 11263: HW, HM, HN series, the counterparts of Sh, K, B to GOST R 57837
L4 · L5 · 74 / 100 kg/m · St3sp / S355GP · GOST 4781 / EN 10248
Larssen sheet pile
Hot-rolled Larssen U-type sheet pile L4 and L5 to GOST 4781-85 with interlocks along the edges; equivalents are U-profiles to EN 10248 and GB/T 20933
GOST 4781-85EN 10248-1:1995EN 10248-2:1995GB/T 20933-2014St3spSt3psS270GPS355GPQ345P
Parameters
| Parameters | |
|---|---|
| Profile | L4, L5; U-profiles EN 10248 to specification |
| Profile width | 400 mm L4, 420 mm L5 |
| Weight | 74 kg/m L4, 100 kg/m L5 |
| Length | 6–12 m, fixed length to specification |
| Steel grade | St3sp, St3ps per GOST 4781; S270GP, S355GP per EN 10248; Q345P per GB/T 20933 |
| Interlock | Larssen type, interlock within a single profile |
Sizes and weight
| Profile | Width, mm | Weight, kg/m | Wall weight, kg/m² |
|---|---|---|---|
| L4 | 400 | 74 | 185 |
| L5 | 420 | 100 | 238 |
Description
A Larssen sheet pile is a hot-rolled trough-shaped section with interlocks along both edges: the piles interlock into a continuous wall that retains soil and water. L4 and L5 are profiles to GOST 4781-85 with the Larssen-type interlock, 400 and 420 mm wide, 74 and 100 kg/m. In EN 10248 such profiles belong to the U-type; mills in China roll them to GB/T 20933. Sheet piles are rolled on beam and heavy-section mills from blooms; the interlock is formed in the final passes and determines the main property of the profile, the free engagement of the interlock and the tightness of the wall.
Steel grades: St3sp and St3ps to GOST 4781-85, S270GP, S355GP and higher to EN 10248-1, Q345P to GB/T 20933. The yield strength of S355GP is 355 MPa against 270 for S270GP, so at the same bending moment it allows a lighter profile or a deeper excavation. Sheet piles are extracted and reused, hence the specification's requirements for straightness and interlock condition, not only for the section.
During inspection at the mill we measure web and flange thickness with a micrometer, profile width and depth with callipers and a tape, and the interlock with a gauge and a trial engagement of two piles; we check straightness, length and surface. We compare the mill test certificate (MTC), its heat number, chemical composition and mechanical properties, against the marking on the pile; bundling and loading are recorded with photographs in the inspection report, with a separate record that the interlocks have not been crushed by slings.
Applications
- excavation and trench shoring
- quays, berths and bank protection
- retaining walls
- temporary cofferdams in rivers and canals
- scour protection of bridge piers
- sewer collectors and water utility pumping stations
Packing and shipment
Bundles of 4–8 piles strapped with steel band, slung over spacers so as not to crush the interlocks; paint marking on each pile: profile, steel grade, length, heat number.
Grade equivalents
| GOST | GB (China) | ASTM | EN | Note |
|---|---|---|---|---|
| St3sp5 / S245 | Q235B | A36 | S235JR | Impact toughness is specified at different temperatures: at −20 °C for St3sp5, at +20 °C for Q235B and S235JR. A cold-climate requirement is written into the specification separately. |
| S275 | Q275B | — | S275JR | Nearest equivalent by yield strength; chemical composition and scope of testing differ between the three standards. |
| 09G2S / S345 | Q355B | A572 Gr.50 | S355JR | Before GB/T 1591-2018 the grade was designated Q345B; certificates for earlier batches may still carry the old name. |
| S355 | Q355C | A572 Gr.50 | S355J0 | Nearest equivalent by yield strength of 355 MPa; impact test temperature and method are specific to each of the three standards. |
| — | Q355B | A992 Gr.50 | S355JR | A992 is a grade for wide-flange beams with an upper limit on yield strength. Nearest equivalent, not an exact match. |
| — | Q345P | A572 Gr.50 | S355GP | Sheet-pile grades. L4 and L5 to GOST 4781-85 are rolled from St3sp and St3ps; GOST has no dedicated sheet-pile grade. Nearest equivalent, not an exact match. |
Equivalents are the closest match, not identical: chemistry and tolerances differ between standards. The exact grade and standard are written into the contract.
Related items
No.5–40 · U / P · h 50–400 · St3sp5 / 09G2S · GOST 8240
Channel GOST 8240
Hot-rolled channel No. 5–40 to GOST 8240-97: U series with tapered flange faces and P series with parallel faces
Buyer questions
How to read a mill test certificate (MTC) for structural sections
Four blocks are checked in the certificate. Standard and grade: the same as written in the specification, not an equivalent. Heat number: matches the marking on the profile and the bundle tag. Heat chemistry: C, Si, Mn, P, S, and for Q355B also V, Nb, Ti, within the grade limits. Mechanical properties: yield strength, tensile strength, elongation and impact toughness at the temperature the grade requires. The bureau checks the certificate against the batch at the mill before shipment and attaches it to the inspection report.
How Q235B differs from St3sp5 and S245
All three have a yield strength of 235 MPa, which is why design calculations treat them as equivalents. The differences lie in test conditions and deoxidation: St3sp5 is impact-tested at −20 °C, Q235B at +20 °C; the suffix sp denotes killed steel, while Q235B to GB/T 700 is supplied rimmed (F) or killed (Z). If the project calls for St3sp5, the specification sets the degree of deoxidation and the test temperature; the mill performs the tests and enters the results in the certificate.
How the tonnage of a section order is calculated
From the theoretical weight per metre in the standard's table: weight per metre × length × number of pieces. The actual weight of a batch differs from the theoretical weight within the standard's weight tolerance, so the contract fixes which weight the batch is settled on: theoretical or actual by weighing. GB and GOST profiles of the same number have different theoretical weights; the specification is calculated to the standard written in it.
What is checked when structural sections are inspected at the mill
Section geometry: depth and flange width with callipers, web and flange thickness with a micrometer, at several points along the length. Shape: squareness of flanges, camber and twist along the length, length. Surface: laps, scabs, cracks, pits. Documents: the mill test certificate against the heat number on the marking and the tag. Packing, piece count and loading, with photographs in the inspection report.
What the minimum batch is and whether different profiles can be combined in one delivery
The batch is sized to your volume; send us the specification. A mill rolls each size to its rolling schedule, so the bureau matches the specification items against mill schedules, assembles the delivery from one or several mills and inspects every batch before shipment.
Price request
Send your specification and we will quote your batch
Steel pricing depends on grade, size, tonnage and delivery terms on the day of contract. A number on the page would be wrong by the time you read it.
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