Post-Weld Treatment

1. Post-Weld Heating (Hydrogen Removal Treatment)

Purpose: Accelerate the diffusion and escape of hydrogen from the weld metal, reducing the risk of delayed cracking, especially for thick plates or structures with high restraint.

Process Parameters:

Heat the welded area to 200–250°C immediately after welding.

Hold the temperature for 1–2 hours, with an additional 0.5 hours of holding time for every 25 mm increase in plate thickness.

Cool slowly with the furnace to room temperature.

2. Stress-Relief Annealing (Optional)

Application Scenarios: Used for critical structures or thick plates (e.g., pressure vessels, components under dynamic loads) to eliminate welding residual stress.

Process Parameters:

Heat to 550–650°C (below the tempering temperature of the base metal to avoid softening).

Holding time is calculated based on plate thickness (1 hour per 25 mm thickness).

Cool with the furnace to ≤300°C, then air-cool to room temperature.

 

 

 

 

 

 

 

Product Name	High strength steel plate Q420,16Mo3 16MnL 16MnR high tensile steel plate/sheet
Length	4m-12m or as required
Width	0.6m-3m or as required
Thickness	3mm-300mm or as required
Standard	AISI,ASTM,DIN,JIS,GB,JIS,SUS,EN,etc.
Technique	Hot rolled
Surface Treatment	Clean, blasting and painting according to customer requirement

 

3. Post-Weld Inspection

Visual Inspection: Check for surface defects such as cracks, undercut, and porosity.

Undercut depth: ≤0.5 mm, with total length ≤10% of the weld length.

Non-Destructive Testing (NDT):

Ultrasonic Testing (UT): Detects internal defects (cracks, slag inclusions, lack of fusion), suitable for thick plates.

Radiographic Testing (RT): Detects volumetric defects (porosity, slag inclusions), suitable for thin plates (≤30 mm).

Mechanical Property Testing (When Necessary):

Tensile test, bend test, and low-temperature impact test (-20°C, impact energy ≥34 J).

 

 

 

 

 

 

 

Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our High Strength Steel Plate Q420, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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