원래 장소:
Zhejiang/China
브랜드 이름:
TORICH
인증:
ISO9001 ISO14001 TS16949
모델 번호:
25MnCr6
The “GB/T 8162 25MnCr6” refers to a seamless steel tube designated under the Chinese national standard GB/T 8162 (for structural use) that is made from a low-alloy, high-strength steel with nominal chemical designation “25MnCr6.” The alloying with Mn (manganese) and Cr (chromium) (and possibly additional trace elements) is intended to provide enhanced strength, toughness, and overall mechanical performance compared to plain carbon steels.
Standard: GB/T 8162-2018 (implements from 2019-02-01)
Shape / Form: Round seamless tube
Outer Diameter / Wall Thickness: As per GB/T 17395 tolerances on diameter and wall thickness, with special allowances for hot-rolled vs cold-drawn.
Delivery Status: Hot-rolled (expanding) or cold-drawn (rolled), with possible heat treatments (annealing, normalizing, tempering) depending on negotiated contract.
Dimensional Tolerances: Tolerances for outer diameter, wall thickness, out-of-roundness, and end squareness as per GB/T 8162 / GB/T 17395.
| Steel Grade | C (wt %) | Mn (wt %) | Cr (wt %) | Si (wt %) | P (max) | S (max) |
|---|---|---|---|---|---|---|
| 25MnCr6 (typical) | 0.20 – 0.29 | 1.20 – 1.60 | 0.30 – 0.60 | ≤ ~0.30 | ≤ ~0.03 | ≤ ~0.03 |
| 25MnCr6 (alternate) | 0.22 – 0.32 | ~1.6 – 2.0 | ~0.8 – 1.1 | ≤ 0.4 | ≤ 0.03 | ≤ 0.03 |
| Q345 (GB low-alloy structural) | ~0.20 – 0.22 | ~1.0 – 1.6 | — | ~0.50 | ≤ 0.035 | ≤ 0.035 |
| 20CrMo (alloy structural) | ~0.18 – 0.23 | ~0.50 – 0.80 | ~0.90 – 1.20 | ~0.17 – 0.37 | ≤ 0.025 | ≤ 0.025 |
| A572 Grade 50 (US HSLA) | ≤ 0.23 | ~1.35 | — | 0.15 – 0.40 | ≤ 0.030 | ≤ 0.030 |
| Steel Grade / Condition | Yield Strength (Rp0.2) [MPa] | Ultimate Tensile Strength (Rm) [MPa] | Elongation (A%) / Toughness |
|---|---|---|---|
| 25MnCr6 (quenched & tempered, typical) | — | 600 – 950 | ~13 % (elongation) |
| 25MnCr6 (alternate literature) | ≥ 785 | ≥ 980 | ≥ 9 % |
| Q345 (typical GB low alloy structural) | ~235 | ~470 – 600 | ~20 – 25 % |
| 20CrMo (quenched & tempered) | ~300 – 500 (depending on thickness) | ~540 – 850 | 12 – 18 % |
| A572 Grade 50 (ASTM) | 345 | 448 | ~18 % (in 200 mm specimen) |
High strength-to-weight: The alloying with Mn and Cr allows the pipe to offer higher strength than plain carbon structural tubes, enabling lighter designs.
Good toughness and ductility: With appropriate heat treatment, the material can maintain acceptable toughness and elongation for structural service.
Better hardenability and fatigue resistance: The alloying elements help delay crack initiation and propagation under cyclic loads.
Weldability and fabricability: Although alloyed, with controlled carbon equivalent and proper preheating/heat input, the steel can be welded and processed much like structural steels.
Consistency and reliability: As a seamless pipe, it avoids the weld seam issues of welded tubes and ensures uniform grain structure and performance in radial direction.
Here are relevant standards (international and regional) that are comparable or sometimes referenced in structural seamless tubes:
GB/T 8162-2018 — Seamless Steel Tubes for Structural Purposes
GB/T 17395 — Dimensions, shapes, weights and tolerances for seamless steel tubes
ASTM A572 / A992 — High-strength, low-alloy structural steels
EN 10210 (Parts 1, 2, 3) — Hot-finished structural hollow sections (non-alloy and fine-grain steels, also high-strength/weather-resistant versions)
ISO / EN / JIS / Russian GOST equivalents (not directly for 25MnCr6 but in the domain of structural seamless tubes)
If the user’s contract calls for impact testing, dimensional tolerances, or non-destructive testing (e.g., ultrasonic, eddy-current), those are also to be referenced from the standard’s test & inspection clauses in GB/T 8162.
| Broad Application Field | Specific Use Cases | Role / Benefits of 25MnCr6 Seamless Pipe |
|---|---|---|
| Construction & Civil Engineering | Steel structures (frames, braces, trusses, columns) | High strength allows thinner-walled members, durability, better safety margins |
| Mechanical / Machinery | Shafts, rollers, bolster tubes, support columns | Good fatigue & toughness properties, reliable geometry, long service life |
| Infrastructure / Utilities | Towers, masts, scaffolding pipes, support poles | Seamless integrity and high strength give robust performance under wind, dynamic loads |
| Transportation / Vehicles | Underframe members, chassis cross-members, structural tubes | Weight-saving and high strength help in vehicle structural components |
| Petrochemical / Offshore Structures (non-pressure) | Structural supports, pipe racks, frames | Corrosion and strength balance, must meet structural specification rather than internal pressure demands |
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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