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17-4 PH · UNS S17400 · EN 1.4542
17-4 PH Stainless Steel for Your Condition-Controlled Parts
Specify the final condition before you release the machining route.
For your 17-4 PH stainless steel machining project, connect heat treatment, dimensional acceptance and material records to the finished drawing.
3 Conditions Your Purchase Order Must Distinguish
Condition A
17-4 PH Condition A identifies solution-treated material. State the required final aging condition and release sequence.
H900
17-4 PH H900 is an aging condition, not another alloy. Keep strength, toughness and final size requirements together.
H1150
17-4 PH H1150 is a different aging condition. Do not approve substitution from a similar name or appearance alone.
For 17-4 PH heat treatment, identify the governing procedure, incoming condition, final condition and required verification. Confirm the final service state with your material authority.
17-4 PH H900 vs H1150: Choose for Your Requirement
H900 vs H1150: Supplier Typical Reference
Custom 630 · room temperature · MPa · axis 0–1500
H900Yield 1262 MPa
Tensile 1365 MPa
H1150Yield 869 MPa
Tensile 993 MPa
Keep the Comparison on the Same Basis
17-4 PH stainless steel properties depend on condition. Higher tensile strength alone does not settle toughness, exposure, inspection or assembly suitability.
Before machining
Confirm stock identity, delivery condition and the final heat-treatment route.
Before acceptance
State whether dimensions and surface checks apply before or after aging.
17-4PH, Type 630 and European Material Names
Stainless steel 17-4 PH is a martensitic precipitation-hardening grade. Search forms such as 17-4PH stainless steel and 17-4 stainless steel should resolve to your full controlled material requirement.
| Name / specification | Your order check |
|---|---|
| Type 630 · UNS S17400 | Retain the actual product form, specification revision and condition. |
| EN 1.4542 · X5CrNiCuNb16-4 | Common European correspondence; supplier references also list 1.4548. Verify the precise standard and permission before substitution. |
| 17-4 PH ASTM A564 | Review the applicable bars-and-shapes requirement and condition. |
| 17-4 PH AMS 5643 | Confirm the actual specification revision, product scope and requested evidence. |
17-4 PH Stainless Steel Composition
Selected Composition Ranges
Custom 630 type analysis · mass % · axis 0–20
Cr
15–17.5%
Ni
3–5%
Cu
3–5%
| Element | Supplier type analysis · mass % |
|---|---|
| Chromium | 15.00–17.50 |
| Nickel / Copper | 3.00–5.00 each |
| Niobium + Tantalum | 0.15–0.45 |
| Carbon | ≤0.070 |
| Manganese / Silicon | ≤1.00 each |
| Phosphorus / Sulfur | ≤0.040 / ≤0.030 |
| Iron | Balance |
Keep composition evidence separate from the final mechanical condition. Request the actual material record and specified test scope for your component.
Plan Your Shaft Features Around the Final State
For 17-4 PH turning services, connect journals, shoulders and bores to the condition in which the part will be inspected.
17-4 PH turning for 17-4 PH shafts and 17-4 PH bushings needs a clear datum scheme, fit and final surface requirement. Agree any allowance for subsequent processing.
For 17-4 stainless steel machining, retain the material condition through procurement and routing rather than treating every temper as the same stock.
CNC Turning →
Review Tool Access, Heat Treatment and Final Machining Together
For 17-4 PH CNC machining, state the current condition and the condition required at final acceptance. 17-4 PH machinability is a routing input, not one universal score.
For 17-4 PH milling and 17-4 PH drilling, identify deep intersections, thin sections and clamping access.
Discuss 17-4 PH grinding where the finished interface requires a reviewed grinding operation. Define the final inspection state and protection against subsequent damage.
CNC Milling → · Review Your Machining Route →
Your Small Turned Features Need a Complete Thread Callout
For 17-4 PH Swiss machining, show diameter transitions, cross features, length relationships and the required stock condition.
For 17-4 PH threaded parts, define thread standard, usable engagement, relief and final fit after all subsequent processing.
Swiss Machining →
Preserve the Functional Surface Through Your Finish Route
For 17-4 PH passivation, agree cleaning, compatibility, treatment timing and evidence requirements for the actual condition.
For 17-4 PH polishing, identify the functional faces, accepted appearance and areas that must remain protected. A bright finish does not prove suitability for a corrosive environment.
Surface Finishing Review → · Brushing & Polishing →
4 Drawing Checks Before Your Route Is Fixed
01 · Final condition
Name the aging condition before accepting strength
State the incoming and final conditions, specification and required material evidence.
Keep final condition, test location and dimensional acceptance on the same release. The photograph cannot establish heat treatment.
1262 / 869 MPaTypical yield · H900 / H1150 · room temperature
Carpenter reference values under its stated conditions; not guaranteed properties of your lot or a finished-part load rating.
Read the source and conditions →
02 · Allowance & sequence
Plan stock removal around the thermal route
Agree which operations occur before and after aging. Do not assume final dimensions stay unchanged.
Show which surfaces finish before or after aging. Agree allowance and inspection state for the actual geometry.
1365 / 993 MPaTypical tensile · H900 / H1150 · room temperature
These source-condition comparisons explain why the aging requirement matters; they do not prescribe machining allowance.
Read the source and conditions →
03 · Thread & journal
Relate the thread and bearing lands to one datum
Connect functional fit, useful thread depth and bearing relationships to final acceptance.
Specify engagement, shoulder positions, runout and inspection access on the controlled drawing.
1.4542EN correspondence · UNS S17400 · Type 630
Confirm product specification and aging condition; these identifiers do not define one hardness or fit.
Read the source and conditions →
04 · Joint & cleanliness
Keep joint cleaning and final acceptance connected
Review the weld route, cleaning and final condition whenever the component includes joining.
Define joining sequence, contamination controls and the final inspection state before release.
3–5%Copper · mass % · supplier chemistry range
A selected precipitation-hardening chemistry reference, not proof that a photographed part meets its specified final condition.
Read the source and conditions →Tie Your Final Condition to Inspection Evidence
Material identity
Grade, product standard, stock form and traceability.
Condition record
Delivery state, final aging condition and specified evidence.
Functional features
Fits, journals, threads and the agreed inspection state.
Release control
Revision, exceptions, finish and packing.
17-4 vs 316 Stainless Steel: Compare the Actual Job
| Your priority | Selection input |
|---|---|
| Strength & final condition | Compare the specified condition, load case and toughness requirements. |
| Fluid or chloride exposure | Review the medium, temperature, cleaning, crevices and surface condition. |
| Joined assembly | Retain procedure, heat-treatment and final acceptance requirements. |
| Alternate PH grade | Compare the exact product specification and condition; do not infer equivalence from the family name. |
5 Inputs for Your Finished 17-4 PH Quote
For your 17-4 PH machining quote, compare the same finished scope. When reviewing a 17-4 PH parts manufacturer, connect the proposed process and evidence to your drawing.
Material
Grade, form and delivery condition.
Heat route
Final condition, process sequence and evidence.
Geometry
Journals, pockets, threads and access.
Surface
Finish, cleaning and protection.
Release
Quantity, inspection and packing.
For 17-4 PH prototype machining, define what the sample must prove and whether its final condition represents your repeat order.
Your Questions Before Ordering 17-4 PH Parts
Is 17-4 PH stainless steel magnetic?
Yes, this martensitic PH family is magnetic. A magnet alone does not verify the grade, heat-treatment condition or specification.
Does 17-4 stainless steel rust?
It can corrode in unsuitable exposure or when surface condition is inadequate. Describe the actual environment, cleaning, stress and final condition.
Can 17-4 PH stainless steel be welded?
Review the joint, procedure, material condition and required post-weld route. Keep final dimensional and material acceptance explicit.
What is 17-4 PH stainless steel used for?
It may be considered for shafts, bushings, fittings and mechanical components where the specified condition suits the application. A material family name is not application qualification.
How much does 17-4 PH machining cost?
Share the drawing, material form, delivery and final conditions, quantities, finish and required records. Compare complete finished-part scope.
Can H900 and H1150 be interchanged?
Only after the governing requirements and substitution permission are reviewed. Their property references differ; appearance does not establish equivalence.
Should you specify Condition A as the final service state?
Do not assume it is the intended final state. The Carpenter source warns against service without age hardening because of stress-corrosion susceptibility; confirm the required final condition.
Can an EN material number replace the complete specification?
No. Retain product form, specification revision, condition and evidence. European names aid material lookup but do not grant substitution approval.
6 Inputs for Your Custom 17-4 PH Parts
For 17-4 PH machining services, define your 17-4 PH machined parts, final condition and inspection requirements as one controlled release.
Drawing
Revision and CAD.
Material
Grade, form and standard.
Conditions
Incoming and final state.
Features
Fits, threads and joints.
Quantity
Prototype and repeat pattern.
Records
Heat treatment, material and inspection evidence.
