St3 · 20 · 45 · 40Kh · Ø10–300 · GOST 2590
Hot-rolled round bar
Round bar Ø10–300 mm in St3, 20, 45 and 40Kh to GOST 2590; equivalents Q235B, 20#, 45#, 40Cr
Long products
Long products are hot-rolled bars of simple cross-section: round, square, flat, hexagonal bar and wire rod in coils. They go into machine building, steel structures, fasteners and the repair shops of enterprises in Uzbekistan. The bureau finds a mill for the grade and rolling tolerance, agrees the specification, inspects the batch before shipment and delivers to your warehouse with the mill test certificate.
GOST 2590-2006GOST 2591-2006GOST 103-2006GOST 2879-2006GOST 30136-95GOST 5949-2018GOST 535-2005GOST 1050-2013GOST 4543-2016GB/T 702-2017GB/T 700-2006GB/T 699-2015GB/T 3077-2015GB/T 1220-2007ASTM A29/A29MASTM A276/A276MEN 10025-2EN 10083-2EN 10083-3EN 10088-3
Items in this category
St3 · 20 · 45 · a 10–200 · GOST 2591
Hot-rolled square bar
Square bar with a side of 10–200 mm in St3, 20 and 45 to GOST 2591; equivalents Q235B, 20#, 45#
St3 · 09G2S · 20×4–200×40 · GOST 103
Hot-rolled flat bar
Flat bar of rectangular cross-section 20×4–200×40 mm in St3 and 09G2S to GOST 103; equivalents Q235B and Q355B
20 · 45 · 40Kh · S 10–75 · GOST 2879
Hexagonal steel bar
Hexagonal bar 10–75 mm across flats in steels 20, 45 and 40Kh to GOST 2879; equivalents 20#, 45#, 40Cr
St1kp · St3 · SAE 1008 · Ø5.5–16 · GOST 30136
Steel wire rod
Round product in coils Ø5.5–16 mm in St1kp, St3 and SAE 1008 to GOST 30136; equivalents Q195, Q235
304 · 321 · 316L · Ø10–200 · GOST 5949
Stainless round bar
Austenitic steel bar Ø10–200 mm: 08Kh18N10, 12Kh18N10T, 03Kh17N14M3 to GOST 5949; equivalents 304, 321, 316L
Description
Long products are bars whose cross-section is defined by one or two dimensions: the diameter of a round, the side of a square, the width and thickness of a flat, the across-flats distance of a hexagon. In Uzbekistan dimensions and tolerances are read from GOST 2590, GOST 2591, GOST 103 and GOST 2879, wire rod from GOST 30136, stainless bar from GOST 5949. Grades range from ordinary-quality St3 to quality carbon steels 20 and 45 and alloy steel 40Kh; stainless round bar is 08Kh18N10, 12Kh18N10T and 03Kh17N14M3.
Mills in China roll long products from continuously cast billet to GB/T 702, taking grades from GB/T 700, GB/T 699 and GB/T 3077, and stainless bar from GB/T 1220. Every GOST grade has a nearest GB grade, but chemical composition and mechanical property limits differ in detail. The bureau therefore fixes in the specification the GOST grade, its GB equivalent and the control values that the mill confirms in the mill test certificate (MTC).
Before shipment the bureau inspects the batch at the mill: measures the cross-section with a micrometer and a calliper, checks the heat number on the tag against the certificate and the chemical composition, checks the marking and the strapping of bundles and coils. The result is an inspection report with photographs, which you receive before the batch leaves. Rejects recorded in the report are replaced — the replacement is supplied by the mill under its contract with the bureau. The batch is sized to your volume — send your specification.
Grade equivalents
| GOST | GB (China) | ASTM | EN | Note |
|---|---|---|---|---|
| St3sp | Q235B | A36 | S235JR | Nearest equivalents: carbon, manganese and impact toughness limits differ between the standards. The specification fixes the GOST grade and the control values. |
| Steel 20 | 20# | 1020 | C22E | Quality carbon steel; the equivalents match in carbon content, impurity limits are checked against the certificate. |
| Steel 45 | 45# | 1045 | C45E | Steel for heat treatment; hardness and delivery condition are checked — hot-rolled, normalised or annealed. |
| 40Kh | 40Cr | 5140 | 41Cr4 | Chromium alloy steel; the equivalents are close in composition, chromium content is confirmed by the heat certificate. |
| 09G2S | Q355B | A572 Gr. 50 | S355JR | Nearest equivalents by strength; 09G2S specifies impact toughness at minus 40 °C, the equivalents use other test temperatures. |
| St1kp | Q195 | 1008 | — | Wire rod for drawing and tying wire; the nearest equivalent by carbon content, there is no single EN grade for this class. |
| 08Kh18N10 | 06Cr19Ni10 | 304 | 1.4301 | Austenitic chromium-nickel steel; nearest equivalents: chromium and nickel ranges differ between the standards, composition is confirmed by the heat certificate. |
| 12Kh18N10T | 06Cr18Ni11Ti | 321 | 1.4541 | Titanium-stabilised; nearest equivalents: the upper carbon limit is 0.12 % for 12Kh18N10T and 0.08 % for 321 and 1.4541; titanium content is checked against the certificate. |
| 03Kh17N14M3 | 022Cr17Ni12Mo2 | 316L | 1.4404 | Molybdenum-bearing, low-carbon; nearest equivalents: the lower nickel limit of 03Kh17N14M3 is higher than that of 316L, composition is confirmed by the heat certificate. |
Equivalents are the closest match, not identical: chemistry and tolerances differ between standards. The exact grade and standard are written into the contract.
Buyer questions
How to read a mill test certificate (MTC) for long products
In the certificate the mill states the heat number, grade and standard, the chemical composition of the heat, the mechanical properties from test results, the size and weight of the batch. The heat number must match the tag on the bundle or coil — this is the first thing the bureau's inspector checks. If the mill rolled to GB, the bureau attaches to the certificate a table of GOST-to-GB grade correspondence and the control values from the specification.
How St3 differs from steels 20, 45 and 40Kh
St3 is an ordinary-quality steel to GOST 535: strength is specified, impurities are allowed within wider limits; it goes into structures and non-critical parts. Steels 20 and 45 are quality carbon steels to GOST 1050: impurities are limited more tightly, properties are set by carbon content, steel 45 is used for hardening and quench-and-temper treatment. 40Kh is a chromium alloy steel to GOST 4543 for shafts, axles and gears after heat treatment. The grade is chosen from the part drawing, not from what is in stock.
How the tonnage of long products is calculated
The theoretical weight per metre is calculated from the cross-sectional area and the steel density of 7.85 g/cm³: round bar 0.006165·d², square bar 0.00785·a², flat bar 0.00785·b·t in kilograms per metre with dimensions in millimetres. The specification and the contract with the mill are drawn up on theoretical weight. Shipment and acceptance at the warehouse go by actual weight from weighing; the difference from theory lies within the dimensional tolerances of the standard.
What the bureau checks when inspecting a batch at the mill
Cross-section — with a micrometer and a calliper in two perpendicular directions on bars from different bundles, checked against the GOST tolerances for the rolling accuracy class. Documents — the heat number on the tag against the certificate, the chemical composition against the specification, for stainless grades a rapid composition check with a portable spectrometer. Appearance — surface free of cracks, laps and scabs, straightness, twist of square and hexagonal bar. Packing — strapping of bundles, a legible tag, grade marking on the bar ends. Everything is recorded in an inspection report with photographs.
How a batch is sized and what to send for a quotation
The batch is sized to your volume — send your specification: steel grade to GOST, product type and cross-section size, rolling accuracy class, bar length or coil weight, volume in tonnes for each size, certificate and packing requirements. On the specification the bureau selects a mill, agrees terms with it and returns to you a draft contract describing inspection and acceptance.
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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