GB/T 8162 25MnCr6 High-Strength Low-Alloy Seamless Pipe for Structural Use

Material Introduction

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.

Specifications

• 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.

Chemical Composition

Mechanical Properties

Major Features

• 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.

Applicable Standards

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.

Application Domains

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

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.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

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.

Who We are ?

-------A professional steel pipes materials inventor, manufacturer and solution provider
Torich International Limited is a professional manufacturer and exporter of steel pipes materials. It is an international marketing and sales company specialized in steel tubes, which holds the factories of Seamless Steel Tubes with Carbon and Alloy Steel Grade, Welded Precision Steel Tubes,DOM Steel Tubes, Seamless & Welded Stainless Steel Tubes with Nickel and Alloy Steel Grade.
Our factory was established since 1997, with the name of TORICH INTERNATIONAL LIMITED. The factories’ technicians are of great engineering experience in steel pipe industry for more than 20 years, which are in great command of production technology for Cold Drawing and Cold Rolling. So we have strong technician team and manufacturing capability.

What products we do?

------- Invent and produce various Precision Steel Pipes

Our steel pipes cover the following ranges:
Seamless Precision Steel Pipes

Bearing Steel Tubes
Welded Precision Steel Pipes, with DOM production
Seamless Heat Exchanger Steel Pipe
Seamless Boiler Steel Pipes

Honed Tubes

Hydraulic Cylinder Steel Tubes

Hydraulic Telescopic Cylinder Tubes
Seamless Structural Steel Pipes
Seamless Mechanical Steel Pipes
Seamless Alloy Steel Tubes & Pipes
Seamless Stainless Steel tubes
Welded Stainless Steel Tubes
Seamless Stainless Steel Tubes & Pipes
Welded Stainless Steel Tubes & Pipes
Seamless Carbon Steel Tubes & Pipes
Nickel Alloy Steel Tubes & Pipes

What TORICH do:
1. Producing Steel Tubes
2. Selling both on Domestic and International Market
3. Precisely Targeting Customers’ Requirement- Sourcing the right factory for right products for Customers

Products Application:
Oil Cylinders
Air Cylinder, 
Automotive Cylinder Liners
Boilers, Pressure Vessels
Shell & Heat Exchangers
Jack Lifting
Telescopic Systems
Pneumatic Cylinders
Agricultural Machineries

Size range is: 
O.D. 4-350mm, 
W.T. 0.5-30mm, 
Length: according to customer’s requirement and agreement
 

Steel Grade:
Carbon Steel Grade:
ST35.8, ST37.0, ST44, ST52;
E155, E195, E215, E235, E275, E355;
195GH, P235GH, P265GH, P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2;
SAE1010, SAE1020, SAE1026, SAE1035, SAE1045;

Carbon steel tube: SA178, A179, A192, A210, SA213, SA214, etc.
Alloy Steel Grade:
T2, T5, T9, T11, T12, T17, T21, T22, T91,T92, 15Mo3,16Mo3, 13CrMo44;
SAE4130, SAE4140, 40Cr, 40Cr4, 10CrMo910, 12CrMo910, 11CrMo910,
25CrMo4, 35CrMo, 35CrMo4, 42CrMo4, 34CrMo4, 20MnV, 20MnV6,20CrMn;
Carbon steel tube: A179,A192,A210,DIN17175,etc.

Bearing Steel Grades:
GCr15 52100 suj2 suj3 100Cr6 SKF3S SKF3S 20CrNiMo 8620H 4118H;

Nickel Alloy Grade:
N02200/2201, N04400, N06600, N06601, N06625, N06852, N06219, N06690, N08800/8810/8811, N08825, N08028, N08535, N08904, N08925, N08926, N010276, N06022, etc.

Austenitic/Super Austenitic Stainless Steel Grade:
304/304L, 316/316L, 314, 321, 347H, 316Ti, 316LMod, 317L/N, 310S, 253MA, 330, 904L, S31254, XM-19, etc. 

Ferrite/Martensite Stainless Steel Grade:
TP410, TP405, TP420, TP430, TP430Ti, TP403, TP409, TP444, TP439, TP446, etc. 

Duplex/Super Duplex Stainless Steel Grade:
S31803, S32304, S31500, S32550, S32750, S32760, etc. 
Corporate Culture:
We focus on Quality First, Quality Traceability, and Quality Stability!
We focus on Customer First, People First, and Quality-Oriented!
Success:
First factory started in 1997, in the name of Torich , now covers 50000 square meters of factory building, with more than 100employees, and over 45 million RBM assets.
In 2008, we started the company of Torich International Limited for international business and marketing.
Welcome partners from all over the world for long term cooperation!