---
title: "17-4 PH Stainless Steel Round Bar | Laxcon Steels"
source: "https://www.laxconsteels.com/products/hot-rolled-round-bars/17-4-ph/"
description: "17-4 PH stainless steel hot rolled round bar, made to order by Laxcon Steels, India: composition, equivalents, weight per metre and tolerances."
---
# 17-4 PH Round Bars

*[Home](https://www.laxconsteels.com/) > [Products](https://www.laxconsteels.com/products/) > [Hot Rolled Round Bars](https://www.laxconsteels.com/products/hot-rolled-round-bars/) > 17-4 PH*

17-4 PH hot rolled round bar is a precipitation hardening stainless bar used for pump and valve shafts, wellhead parts and aerospace fittings.

16 to 125 mm Precipitation hardening stainless steel Made to order

## 17-4 PH hot rolled round bar

17-4 PH hot rolled round bar is a precipitation hardening stainless steel bar, rolled from 16 to 125 mm in diameter and hardened by a single ageing treatment rather than by quenching. Chromium at 15.0 to 17.5 percent carries the corrosion resistance, and copper at 3.0 to 5.0 percent forms the fine particles that give the strength. The grade is taken over 410 and 431 martensitic bar where a part must reach higher strength and resist corrosion better than a plain hardening grade. It is taken over 304 and 316 bar because neither of those hardens by heat treatment. 15-5 PH is the near neighbour, chosen instead when toughness across the bar matters, because it holds less delta ferrite, a soft second phase left from rolling.

The bar is supplied solution treated, called Condition A, a soak that dissolves the hardening elements and leaves the bar soft enough to machine and drill. Ageing follows at 482 to 621 degrees Celsius, from H900 to H1150, done by the customer after machining or specified on the order. The hold is low in temperature and needs no quench, so distortion is small and a finished part can be aged last. ASTM A564 sets 1310 MPa tensile strength and 1170 MPa yield for H900, and 930 MPa with 725 MPa for H1150, which gives up strength for toughness. The grade welds without preheat, with ER630 filler to AWS A5.9, and the weld is aged with the part. Bar of this size goes into pump and valve shafts, wellhead and downhole parts, aerospace fittings and paper machinery rolls.

Composition limits in weight percent are carbon 0.07 maximum, manganese 1.0 maximum, sulphur 0.03 maximum, phosphorus 0.04 maximum, silicon 1.0 maximum, chromium 15.0 to 17.5, nickel 3.0 to 5.0, copper 3.0 to 5.0 and niobium plus tantalum 0.15 to 0.45.

## 17-4 PH hot rolled round bar supply conditions

| Property | Value |
| --- | --- |
| Size range | 16 mm - 125 mm (5/8" - 5") |
| Length | Up to 8 metres |
| Tolerances | ASTM A484, EN10060 |
| Heat treatment | Solution treatment (Condition A); ageing to order |
| Grade | 17/4-PH (17-4PH, 17/4 PH, 630, SUS 630) |
| Family | Precipitation hardening stainless steel |
| Supply | Made to order in this grade; every published size of the form |

## Composition of 17-4 PH

| Element | Symbol | Minimum % | Maximum % |
| --- | --- | --- | --- |
| Carbon | C |  | 0.07 |
| Manganese | Mn |  | 1.0 |
| Sulphur | S |  | 0.03 |
| Phosphorus | P |  | 0.04 |
| Silicon | Si |  | 1.0 |
| Chromium | Cr | 15.0 | 17.5 |
| Nickel | Ni | 3.0 | 5.0 |
| Copper | Cu | 3.0 | 5.0 |
| Niobium plus tantalum | Nb+Ta | 0.15 | 0.45 |

Composition, weight percent, balance iron. From the Laxcon Steels grade reference.

## Equivalents of 17-4 PH

| Standard | Designation |
| --- | --- |
| UNS | S17400 |
| EN number | 1.4542 |
| JIS | SUS 630 |

Equivalence means nearest counterpart, not identity: each standards body sets its own composition window, so the limits of the standard named on the order govern.

## Governing standards

| Property | Value |
| --- | --- |
| EN 10088-3 | Stainless steels: technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products for general purposes. Composition, heat treatment condition and mechanical properties per grade. |
| EN 10060 | Hot rolled round steel bars for general purposes: dimensions and tolerances on shape and dimensions. |
| ASTM A276/A276M | Stainless steel bars and shapes: composition, condition, mechanical properties and finish designations for hot-finished and cold-finished bar. |
| ASTM A484/A484M | General requirements for stainless steel bars, billets and forgings: permissible variations in dimensions, straightness, weight and length, and the test and marking requirements every bar order inherits. |
| ASTM A479/A479M | Stainless steel bars and shapes for use in boilers and other pressure vessels: the bar specification a pressure-part drawing calls for. |
| ASTM A314 | Stainless steel billets and bars for forging. |
| NACE MR0175 / ISO 15156 | Materials for use in H2S-containing environments in oil and gas production: the sour-service limits on hardness and condition. |
| ASTM A564/A564M | Hot-rolled and cold-finished age-hardening stainless steel bars and shapes: the conditions A, H900 to H1150 and the properties each guarantees. |
| AMS 5643 | 17-4PH (UNS S17400) bars, forgings and rings: the aerospace material specification for the grade. |
| EN 10204 | Metallic products, types of inspection documents: the 2.2 test report and the 3.1 and 3.2 inspection certificates a purchase order can call for. |

## Weight per metre

| Diameter (mm) | kg per metre | Metres per tonne |
| --- | --- | --- |
| 16 | 1.59 | 629.5 |
| 17 | 1.79 | 557.6 |
| 18 | 2.01 | 497.4 |
| 19 | 2.24 | 446.4 |
| 20 | 2.48 | 402.9 |
| 21 | 2.74 | 365.4 |
| 22 | 3.00 | 333.0 |
| 23.2 | 3.34 | 299.4 |
| 24 | 3.57 | 279.8 |
| 25 | 3.88 | 257.9 |
| 26 | 4.19 | 238.4 |
| 27 | 4.52 | 221.1 |
| 28 | 4.86 | 205.6 |
| 30 | 5.58 | 179.1 |
| 32 | 6.35 | 157.4 |
| 34 | 7.17 | 139.4 |
| 36 | 8.04 | 124.4 |
| 37 | 8.49 | 117.7 |
| 38 | 8.96 | 111.6 |
| 40 | 9.93 | 100.7 |
| 42 | 10.95 | 91.4 |
| 45 | 12.57 | 79.6 |
| 47 | 13.71 | 73.0 |
| 48 | 14.30 | 69.9 |
| 50 | 15.51 | 64.5 |
| 53 | 17.43 | 57.4 |
| 56 | 19.46 | 51.4 |
| 57.5 | 20.52 | 48.7 |
| 60 | 22.34 | 44.8 |
| 63 | 24.63 | 40.6 |
| 66 | 27.03 | 37.0 |
| 67.5 | 28.27 | 35.4 |
| 70 | 30.40 | 32.9 |
| 73.5 | 33.52 | 29.8 |
| 75 | 34.90 | 28.7 |
| 77.5 | 37.27 | 26.8 |
| 80 | 39.71 | 25.2 |
| 83 | 42.75 | 23.4 |
| 85 | 44.83 | 22.3 |
| 88 | 48.05 | 20.8 |
| 90 | 50.26 | 19.9 |
| 93 | 53.67 | 18.6 |
| 95 | 56.00 | 17.9 |
| 98 | 59.59 | 16.8 |
| 100 | 62.05 | 16.1 |
| 105 | 68.41 | 14.6 |
| 106 | 69.72 | 14.3 |
| 110 | 75.08 | 13.3 |
| 115 | 82.06 | 12.2 |
| 120 | 89.35 | 11.2 |
| 125 | 96.95 | 10.3 |

Density 7.90 g/cm³, diameter squared x 0.006205. Sizes are the published range at the nominal diameters shown.

## Ordering 17-4 PH hot rolled round bar

An enquiry states the grade as 17-4 PH to ASTM A479 or EN 10088-3, the condition wanted and whether the mill ages the bar and to which temper, the diameter with its tolerance to ASTM A484 or EN 10060, the finish as black, spot ground or fully ground, the cut length, the quantity, the certificate type to EN 10204, and any ultrasonic test, PMI check or NACE MR0175 sour service requirement.

## Other grades in Round Bars

- [**AISI 304** The general purpose austenitic stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-304/)
- [**AISI 316** The molybdenum-bearing austenitic grade](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-316/)
- [**EN 8** A medium-carbon unalloyed engineering steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/en-8/)
- [**Duplex 2205** The standard duplex stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/duplex-2205/)
- [**SAE 4140** The chromium-molybdenum through-hardening steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/sae-4140/)
- [**AISI 303** The free-machining austenitic grade](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-303/)
- [**AISI 316L** The low-carbon version of AISI 316](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-316l/)
- [**AISI 410** The basic martensitic stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-410/)
- [**SAE 4340** The nickel-chromium-molybdenum through-hardening steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/sae-4340/)
- [**AISI 416** The free-machining martensitic grade](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-416/)
- [**AISI 420** A higher-carbon martensitic stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-420/)
- [**AISI 431** A martensitic stainless steel with nickel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-431/)
- [**AISI 304L** The low-carbon version of AISI 304](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-304l/)
- [**AISI 430** The standard ferritic stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-430/)
- [**EN 24** A nickel-chromium-molybdenum engineering steel for heavy sections](https://www.laxconsteels.com/products/hot-rolled-round-bars/en-24/)
- [**Super duplex 2507** A super duplex stainless steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/super-duplex-2507/)
- [**AISI 310S** A high-chromium, high-nickel austenitic grade for continuous service](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-310s/)
- [**AISI 321** AISI 304 stabilised with titanium](https://www.laxconsteels.com/products/hot-rolled-round-bars/aisi-321/)
- [**EN 19** A chromium-molybdenum engineering steel](https://www.laxconsteels.com/products/hot-rolled-round-bars/en-19/)

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