Choose a plate finishing route.
Six Ground Faces Within the E1 Envelope
E1 is Lichengda’s reference for the defined six-side precision-ground supply option. All six faces are ground to the agreed finished dimensions within the confirmed grade, material-condition and size limits. The designation is not a universal grade, an industry-wide product standard or a guarantee for every steel block.
Use the approved drawing to identify the dimensions, datums and additional geometric requirements for the next operation. Ground finish alone does not define flatness, perpendicularity, roughness or acceptance after later machining or heat treatment.
E1 Tolerances and Size Limits
| Requirement | E1 specification |
|---|---|
| Length | ±0.02 mm; length no more than 600 mm |
| Width | ±0.02 mm; width no more than 600 mm |
| Thickness | ±0.02 mm; thickness 10–200 mm |
| Parallelism | 0.02 mm per 100 mm |
| Delivery condition | The specific pre-hardened or hardened-and-tempered condition listed for the grade |
All eligibility conditions must apply together. The per-100-mm parallelism figure is not an automatic whole-block flatness limit. State any separate span, datum or surface requirement on the drawing for confirmation.
Grade and Model Options
Eight grade/condition combinations are confirmed for this E1 scope. Pre-hardened options are 718H, 1.2738, NAK80 and 1.2316. Hardened and tempered options are S136, D2, SKD11 and DC53. The table keeps each grade separate and supplies the correct condition with the model inquiry.
| Grade | Material condition | Catalog reference | Drawing-specific inquiry |
|---|---|---|---|
| 718H | Pre-hardened | LCD-PL-718H-E1 | Inquire about this option → |
| 1.2738 | Pre-hardened | LCD-PL-1.2738-E1 | Inquire about this option → |
| NAK80 | Pre-hardened | LCD-PL-NAK80-E1 | Inquire about this option → |
| S136 | Hardened and tempered | LCD-PL-S136-E1 | Inquire about this option → |
| 1.2316 | Pre-hardened | LCD-PL-1.2316-E1 | Inquire about this option → |
| D2 | Hardened and tempered | LCD-PL-D2-E1 | Inquire about this option → |
| SKD11 | Hardened and tempered | LCD-PL-SKD11-E1 | Inquire about this option → |
| DC53 | Hardened and tempered | LCD-PL-DC53-E1 | Inquire about this option → |
Catalog references identify grade/finish scope. Dimensions, material records and acceptance follow the approved order. Schematics illustrate the model option; a general photograph does not establish a specific grade or tolerance.
Blocks That Need a Separate Tolerance Review
Length or width above 600 mm, thickness below 10 mm or above 200 mm, annealed material and unlisted grades/conditions are outside this E1 envelope. Larger processing capacity does not extend the ±0.02 mm promise. H13 and 1.2344 are not listed E1 combinations.
For those requirements, discuss another finishing route or separately agreed dimensions and tolerances. A plate that exceeds an E1 limit can still be submitted for technical review; an inquiry is not automatic acceptance of the highest precision.
Reports and Handover
Specify material documentation, hardness and dimensional report requirements before ordering. Define any requested UT standard, coverage and acceptance scope separately. For incoming inspection, compare the same drawing revision, material condition, feature definition and measurement setup.
Typical plate production is 3–7 working days under the agreed order-start conditions: formal PO receipt, final drawing/specification approval and applicable deposit receipt must all be complete. Count from the next working day, excluding weekends and statutory public holidays in China; transport time is separate.
Prepare an Eligible E1 Inquiry
Provide the grade, required delivery condition, finished dimensions, quantity, drawing revision and any additional inspection requirements. Keep the delivered blank size distinct from dimensions needed after your own processing.
Prepare an inquiry with E1 selected, or compare all plate finishes. The inquiry tool reviews the material/condition and size envelope; outside-scope requirements remain available for a separate technical review.