Deep drawing
How can I reduce cracking when deep drawing stainless steel?
Answer
Austenitic stainless such as 304 and 316L work-hardens as it is drawn, which raises the force needed for each subsequent stage and increases the risk of tearing at the punch radius. Deep parts usually require more stages and often intermediate annealing. Stainless also has a strong tendency to adhere to tool steel, so die materials, coatings and lubrication are selected to resist galling rather than simply to reduce friction.
Sources
- Deep Drawing Aluminium vs Stainless Steel: Tooling ChangesAustenitic stainless such as 304 and 316L work-hardens as it is drawn, which raises the force needed for each subsequent stage and increases the risk of tearing at the punch radius. Deep parts usually require more stages and often intermediate annealing. Stainless also has a strong tendency to adher...
- Precision Hardware Stampings | Balford Custom MetalCommon stamping defects include: deformation and burrs on precision parts; cracks, warping, surface scoring, and corner distortion on bent parts; flange wrinkles, wall wrinkles, wall damage, and cracking on deep-drawn parts; and edge cracks or uneven stretching on formed features. Here's how to addr...
- Deep Drawing Aluminium vs Stainless Steel: Tooling ChangesDecision Aluminium Stainless steel Draw ratio per stage More generous More conservative; more stages Die clearance Tighter relative control to limit burrs and marking Set to accommodate work hardening and springback Radii Larger radii reduce cracking risk Radii balance crack risk against thinning Lu...
- Drawing Die Straight Wall Cracking Causes | Balford① Poor die surface finish or fit: If the product cracks and the flange shows scratches, polish the die surfaces with a grinding wheel to get a smooth finish that lets material flow easily. ② Die gap too tight: ②the gap is too small: When the side wall shows a shiny, cracked surface, that's typically...
- Metal Stamping Defects: Causes and Solutions | BalfordWhen a stamped part fails inspection, classify the defect first. The family determines which root causes are plausible: Dimensional deviation — features out of tolerance: springback, die wear, material thickness drift, press or tool alignment issues. Cracking and fracture — splits or tea...
- Metal Stamping Defects: Causes and Solutions | BalfordTooling condition. Worn punch/die edges, damaged radii, or a die that is not parallel increase local stress. Galling on the die radius also raises friction and can pull the material into a split. Lubrication failure. Insufficient or wrong lubricant raises friction on forming surfaces, increasing ten...
What an engineer still needs from you
- material and material condition (grade, temper)
- material thickness, plus the key diameter, height and wall thickness
- tolerances, burr direction and the visual acceptance standard
- annual volume - it decides whether tooling is single-hit, progressive or transfer
- surface finish, and any secondary machining, annealing or plating
Need a DFM feasibility assessment for your project?
Send the engineering drawing (STEP or PDF) with the material grade, thickness and annual volume. Balford engineers then check it against the process window - draw ratio, wall thickness, tolerances, blank and tooling route - and come back with what is feasible and what is not. An answer on this page cannot replace that review.
Upload a drawing for DFM reviewHow the DFM review worksRelated questions
- What is deep drawing?
- Deep drawing vs progressive die stamping: which process fits my part?
- What is the maximum deep draw diameter and press capacity?
- What draw ratio is possible in one deep drawing stage?
- How do I calculate the blank size for a deep drawn cup?
- What are the common deep drawing defects and their causes?
This page is an engineering answer, not a quotation and not a dimensional acceptance. It is generated from Balford's published material and held to the verified company fact sheet.